Once again, I do not recommend that you run a 4S pack with the stock Align 430XL motor. If you want to anyway, despite this advice, you should at very least least get an external BEC, such as the SportBEC, and drop your pinion down to 10T (if you can find one).

For a 4S setup, you should check out the lower kV motors from brand like MedUSA, Scorpion and NEU.

My $0.02. Your heli is yours to do with what you want.