Well, rad already has -damage, so if you haven't tried it already it might not be a bad idea to try stacking the -damage from toxic rounds and seeing how that pans out. The other option I guess would be trying cryo rounds + lingering rad. Even ~40% recharge debuff always helped out on my dominator.
Active (Freedom): Setna (Ice/Psi Dom), Arram (WP/KM Tank), Tesmiel (Elec/SS Tank), Astredax (Robot/Dark Mastermind), Operative Vidali (melee fortunata)
Retired (Virtue): Gaav (Inv/EM Tank), Baqra (Fire/SS Tank)
Radiation Infection slotted for -tohit will pretty much eliminate any soloing problems you may have.
From my current experience with DP, I'd say take and slot Suppressive Fire to eliminate any trouble enemies, and 6 slot your T1 and T2 attacks for 1 acc, 3 dmg and 2 damage procs (hey, it even goes with your theme!) Explosive Strikes and Impeded Swiftness are dirt cheap to buy on the market, proccing your Pistols power with Lady Grey's and Shield Breakers will be slightly expensive though.
If you can spare the slots later I would then give the same treatment to Executioner's and then your AoE powers, though note that you want to be firing your T1 and T2 whenever they are up as they leverage the procs better.
Oh, and use Incendiary Ammo.
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... well, really just one question.
"Curveball" is an old character from pen-and-paper roleplaying games (mostly Champions) that I've never been able to faithfully re-create using the CoH powerset. In the pnp games he was a luck-based character (i.e., hexing enemies, etc) so I generally use the name when I'm playing around with buffing/debuffing characters, and when DP came out I thought I'd try him out as a DP/Rad. This is actually the closest CoH has ever come, concept-wise, to the original character, because now that you can tweak the colors of your primary and secondary powersets it's easy to think of the debuffs in rad as a number of different hex powers, and the pistol-fu visuals in the DP set pretty much define the term "lucky shot."
So concept-wise that's great. Game wise I'm finding DP a difficult set to use. It has a lot of interesting effects, but it doesn't exactly kill things quickly, which was never a problem I had playing a corruptor in the past... I mean it wasn't blaster damage, but it still was pretty decent... DP for corruptors is... not decent. I find that poor old Curveball faceplants a lot, either because the corruptor level rad debuffs aren't great or DP damage doesn't chip away at the enemies fast enough.
Are there any good DP guides yet? Does anyone have any useful mitigating strategies for playing a DP? I'm not talking about the best way to slot your powers, I'm talking about the best way to play the set before you get to 50. Curveball is at 16 now and the combo -- which I thought would actually work really well together -- is getting really frustrating to play...
Scrapper Jack (SJ/WP Brute), Sky Commando (WP/SJ Tanker), Curveball (Rad/DP Defender), and a bunch more.