It's end draining you've got there with the elec primary. Devices I'm not too sure about, although used in conjuction with elec, it should be good.
In terms of making your character look speedy or seem speedy, I'd think a bot kind of thing would work. Sharp edges, etc. Power wise, well anything caught in Caltrops will make you look faster for a start 
I have had great fun with my Elec/Dev blaster. Super Speed is a good choice as its Stealth component combines with Cloaking Device to render you completely invisible to most mobs. I often start a fight be going in and planting a trip mine and queing up my caltrops.
You get access to 2 pets as well but I have skipped Voltaic Sentinal. Recall Friend combines well with Auto Turret and then you can move it with you. Auto Turret can also take Aggro and is quite tough. Plant some mines throw down some Caltrops and then stick an Auto Turret behind.
all u need to do is get finess (pool power) then u'll be find, to have extra end...... get some badges like
"Atlas M.". For SS (Super Speed) get hasten and of corse get SS (Super Speed)......... NEVER get "Whirl Wind" couse its a end.... drainer. Thats All 
The problem with Elec is that is has few good single target attacks. It only has 2 standard ones, Charged bolts and Lightning Bolt.
The third power, ball lightning is probably the reason you are running out of end quicker than the other blasters ( what powersets do they have? ) as it is AoE and so costs lots of endurance.
The endurance recovery element of elec is rare and doesn't recover much endurance. It only works on the single target attacks.
As for Devices, you probably know already, I personally use Targetting Drone, Cloaking Device, Caltrops and Smoke Grenade.
@Unthing ... Mostly on Union.
Okay, so, I made a new Blaster tonight, having not played one since my AR/Dev one last summer. I went with Electricity this time, but stuck with Devices, as I didn't really like the look of the other secondaries.
So far, I've got the first three Elec Blast powers and Web Grenade, and when teaming with two other Blasters, I seemed to burn up my endurance a lot faster than the other two, which worried me because I was supposed to be drawing endurance from the enemies with my attacks. Now can I deal with this in later levels? Any general tips for a Elec/Dev Blaster?
Also, I'm interested making him a "speedster" later on, rather than take my usual route of hover and flight. Along with simply taking Hasten and Superspeed, what else can I do to make him seem like a "speedster", like The Flash?