@Chainsaw_Plankton, I was using a modified version of a Harpy for the serp daredevil for a while but recently switched over to use your cap-stable hawk and decided to mess with it a little bit:
[Hawk, * Agent Serpentis Daredevil]
Ballistic Control System II
Ballistic Control System IIPithi A-Type Small Shield Booster
Upgraded Kinetic Deflection Amplifier I
Republic Fleet Small Cap Battery
Caldari Navy Stasis Webifier
Caldari Navy Stasis WebifierRocket Launcher II, Scourge Rage Rocket
Rocket Launcher II, Scourge Rage Rocket
Rocket Launcher II, Scourge Rage Rocket
Rocket Launcher II, Scourge Rage Rocket
200mm AutoCannon II, EMP SSmall Warhead Calefaction Catalyst II
Small Warhead Rigor Catalyst I
Basically, drop the medium C-Type for the small A-Type. While this is a bit more expensive, the reduced cap consumption means you can upgrade 1 battery to RF and drop the other and the rigs. The reduced boost has to be supplemented with some extra resists, but a passive mod is more than enough. If you use a meta with reduced cpu, you can downgrade the CNBCS down to a simple BC2 if you want to (more than) offset some of the other mod costs and still have room to replace the rigs with those from the original hawk fit. The net result is this ship is a cap stable version of the original having to only drop the TP.
As pasted above, it is cap stable at 36%, has a tank of 312 against the daredevil damage profile (154+110=264).
BTW, thanks a ton for all the info, your fits have been great!