Look at it this way:
You're asking the engine to put 400 to the wheels on blower alone. That is going to require one of 2 things, psi or rpm. Once you pulley down into big boy territory with the TVS, meth ain't gonna cut it. All it takes is a tiny hiccup in the meth line and *KABOOM* I'd suggest full on E85.
Some back of the envelope calculations get us this:
400whp at 15% driveline loss = 470 crank hp + 60 hp minimum blower loss. That's 530 crank hp the engine has to make BEFORE
nitrous. That's a lot of fuel. Roughly 53 lb/min of airflow. For comparision, my little turbo car flows roughly 49-50 lb/min at 23psi.
Now, on to the fueling. I know from previous research that fueling becomes a problem with TVS cars above the 350-ish mark. For safety's sake, you want at least 80% duty cycle out of your injectors.
ID1000's are 95# injectors.
Punching some numbers into Injector Dynamics handy dandy fuel calculator gets us this: Fuel Flow Calculator - Injector Dynamics
7200 rpm limiter, 24 psi ( low estimate, probably more like 26/27 )
E0 fuel with stock FPS ( 58 psi ) = no result, out of range
E0 fuel with BRFPS at 58 psi = ID1000's at roughly 52% IDC
E0 fuel with BRFPS at 42 psi = ID1000's at roughly 60% IDC
E85 fuel with BRFPS at 58 psi = ID1000's at roughly 80% IDC
E85 fuel with BRFPS at 42 psi = ID1000's at roughly 90% IDC
FWIW, this calculator is pretty accurate. Putting in my numbers at 23 psi of boost, 42 psi of fuel pressure with a BRFPS, and E30 fuel gets about 65% IDC. I have logged 64% IDC on WOT pulls with that setup. Putting in my numbers for full 85 puts me at about 80% IDC. Time to up the fuel psi I suppose...
ETA: If you're gonna run a wet shot of juice, you'll need a serious fuel pump and possibly line upgrade. A dry shot would need all that plus even bigger injectors.
Please do not neglect your fueling.