jl tw3 d4

I currently have a pair of 12TW3 D4 in parallel @1 Ohm being pushed by memphis 16 srx1.750d However this amp is stable at 2 Ohms I believe. I feel that the subs can perform much better but honestly they hit hard with that amp. I also just bought a JL RD 400/4 with some Alpine R-S68 RMS of 100...