Hi Randy,
The warp 11 may be overkill. I run an ADC 9" with a Z1K and 54x 100Ah Thunder Sky LiFePO4 in my 914 (the older pre-yttrium variant). I have the battery current limit set for 500A so I don't over-stress the pack, and I try not to take it even that high most of the time (but you know, sometimes my foot has a mind of its own...)
I can honestly say that the limiting factor seems to be the max power of the batteries, not the max torque of the motor. Launches are crazy -- it beats my Tesla S60 off the line; it's once I'm already up to speed and I hit my battery current limit that I start to run out of "go." I think I'm already putting too much stress on the poor 914 components -- I've shredded 2nd gear (still working on the rebuild after that one) and seem to have wrecked a CV joint. Granted, it's hard to tell what would have failed anyway after 40 years and 100k miles, but I don't find myself wishing I had an 11" motor.
On the other hand, if you are serious about that 200A battery current limit, I believe the Warp 11 will give you a little more torque for your limited battery power (200A * 170V = 34kW). If I remember correctly, the ESR on my 9" is 31milliohms, so 1000A wastes 30V at stall (=176A @ 170V ignoring controller and battery efficiency). So with a 9" your Z1k would be wasted almost as soon as your motor starts turning and producing back EMF. The Warp11, by virtue of being bigger, can achieve lower ESR for a given torque constant, which means you'll waste less of your precious 34kW in winding loss. It is difficult though to quantify what you could realistically expect, but even 100% efficiency still has you topping out at 1000RPM before torque falls below 9" levels (240 ft-lb * 1000RPM = 34kW)
Not enough to justify the weight and cost, in my opinion, but that's your decision to make.
My $0.02.
-Ben