Heya, not the biggest expert on fire/fire blasters but here goes (oo and i may be guessing a lil bit, i would have like to copy/paste ur build into mids but you didnt post the data string 
and i've not got time to rebuild it at the mo lol)
Re the Gaussian's in aim and build up, i'm presuming you're slotting them for the damage buff and not to help softcap melee/smahing/lethal defence given the other recipies in your build. If so, it might be worth putting the chance to buildup in tactics instead of aim as it'll have more chance to activate (don't know the numbers).
Are you making a fully ranged build as well? I notice alot of your secondary haven't been taken (as well as ROF from your primary). I think perhaps an idea of what you're going for would help critiquing the build 
Hehe Sorry about the missing data chunk...I am new to Mids, seems like a fun little tool to play with tho
Indeed it is! Beware, you can spend hours in it :P
Hi all
just curious what ya think about the build on my first toon...I made her a few years ago and LOVE to play her still so I am just being nosy for your opinions!
Hero Plan by Mids' Hero Designer 1.90
http://www.cohplanner.com/
Click this DataLink to open the build!
Fire/Fire: Level 50 Magic Blaster
Primary Power Set: Fire Blast
Secondary Power Set: Fire Manipulation
Power Pool: Speed
Power Pool: Leadership
Power Pool: Leaping
Power Pool: Concealment
Ancillary Pool: Flame Mastery
Hero Profile:
Level 1: Flares
- (A) Devastation - Accuracy/Damage
- (3) Devastation - Damage/Endurance
- (11) Devastation - Damage/Recharge
- (17) Devastation - Accuracy/Damage/Recharge
- (27) Devastation - Accuracy/Damage/Endurance/Recharge
- (29) HamiO:Nucleolus Exposure
Level 1: Ring of Fire- (A) Accuracy IO
Level 2: Fire Blast- (A) Devastation - Accuracy/Damage
- (3) Devastation - Damage/Endurance
- (5) Devastation - Damage/Recharge
- (15) Devastation - Accuracy/Damage/Recharge
- (25) Devastation - Accuracy/Damage/Endurance/Recharge
- (33) HamiO:Nucleolus Exposure
Level 4: Fire Ball- (A) Ragnarok - Damage
- (5) Ragnarok - Damage/Recharge
- (11) Ragnarok - Accuracy/Damage/Recharge
- (15) Ragnarok - Accuracy/Recharge
- (25) Ragnarok - Damage/Endurance
- (29) Ragnarok - Chance for Knockdown
Level 6: Hasten- (A) Recharge Reduction IO
- (7) Recharge Reduction IO
- (7) Recharge Reduction IO
Level 8: Assault- (A) Endurance Reduction IO
- (39) Endurance Reduction IO
Level 10: Super Speed- (A) Run Speed IO
Level 12: Aim- (A) Gaussian's Synchronized Fire-Control - To Hit Buff
- (13) Gaussian's Synchronized Fire-Control - To Hit Buff/Recharge
- (13) Gaussian's Synchronized Fire-Control - To Hit Buff/Recharge/Endurance
- (31) Gaussian's Synchronized Fire-Control - Recharge/Endurance
- (31) Gaussian's Synchronized Fire-Control - To Hit Buff/Endurance
- (31) Gaussian's Synchronized Fire-Control - Chance for Build Up
Level 14: Combat Jumping- (A) Luck of the Gambler - Recharge Speed
- (37) Karma - Knockback Protection
- (37) Defense Buff IO
Level 16: Build Up- (A) Gaussian's Synchronized Fire-Control - To Hit Buff
- (17) Gaussian's Synchronized Fire-Control - To Hit Buff/Recharge
- (21) Gaussian's Synchronized Fire-Control - To Hit Buff/Recharge/Endurance
- (40) Gaussian's Synchronized Fire-Control - Recharge/Endurance
- (40) Gaussian's Synchronized Fire-Control - To Hit Buff/Endurance
Level 18: Blaze- (A) Apocalypse - Damage
- (19) Apocalypse - Damage/Recharge
- (19) Apocalypse - Accuracy/Damage/Recharge
- (21) Apocalypse - Accuracy/Recharge
- (23) Apocalypse - Damage/Endurance
- (23) Apocalypse - Chance of Damage(Negative)
Level 20: Stealth- (A) Luck of the Gambler - Recharge Speed
Level 22: Tactics- (A) Endurance Reduction IO
- (39) Adjusted Targeting - To Hit Buff/Endurance
- (39) Adjusted Targeting - To Hit Buff
Level 24: Grant Invisibility- (A) Luck of the Gambler - Recharge Speed
Level 26: Blazing Bolt- (A) Sting of the Manticore - Accuracy/Damage
- (27) Sting of the Manticore - Damage/Endurance
- (33) Sting of the Manticore - Accuracy/Interrupt/Range
- (33) Sting of the Manticore - Damage/Interrupt/Recharge
- (34) Sting of the Manticore - Damage/Endurance/Recharge
- (34) Sting of the Manticore - Chance of Damage(Toxic)
Level 28: Phase Shift- (A) Recharge Reduction IO
Level 30: Maneuvers- (A) Luck of the Gambler - Recharge Speed
- (43) Kismet - Accuracy +6%
Level 32: Inferno- (A) Armageddon - Damage
- (34) Armageddon - Damage/Recharge
- (36) Armageddon - Accuracy/Damage/Recharge
- (36) Armageddon - Accuracy/Recharge
- (36) Armageddon - Damage/Endurance
- (37) Armageddon - Chance for Fire Damage
Level 35: Vengeance- (A) Luck of the Gambler - Recharge Speed
Level 38: Super Jump- (A) Blessing of the Zephyr - Knockback Reduction (4 points)
Level 41: Char- (A) Unbreakable Constraint - Hold
- (43) Unbreakable Constraint - Hold/Recharge
- (43) Unbreakable Constraint - Accuracy/Hold/Recharge
- (45) Unbreakable Constraint - Accuracy/Recharge
- (45) Unbreakable Constraint - Endurance/Hold
- (45) Unbreakable Constraint - Chance for Smashing Damage
Level 44: Fire Shield- (A) Impervious Skin - Status Resistance
- (46) Impervium Armor - Psionic Resistance
- (46) Steadfast Protection - Knockback Protection
- (46) Aegis - Psionic/Status Resistance
Level 47: Rise of the Phoenix- (A) Absolute Amazement - Stun
- (48) Absolute Amazement - Stun/Recharge
- (48) Absolute Amazement - Accuracy/Stun/Recharge
- (48) Absolute Amazement - Accuracy/Recharge
- (50) Absolute Amazement - Endurance/Stun
- (50) Absolute Amazement - Chance for ToHit Debuff
Level 49: Melt Armor- (A) Undermined Defenses - Defense Debuff
- (50) Undermined Defenses - Recharge
------------Level 1: Brawl
- (A) Accuracy IO
Level 1: Sprint- (A) Celerity - +Stealth
Level 2: Rest- (A) Recharge Reduction IO
Level 1: DefianceLevel 4: Ninja Run
Level 2: Swift
- (A) Run Speed IO
Level 2: Hurdle- (A) Jumping IO
Level 2: Health- (A) Healing IO
- (9) Healing IO
- (42) Numina's Convalescence - Heal
Level 2: Stamina