In my opinion, performance will be relatively similar. With that battery, you are about at the top for wattage, but you could perhaps bump to a 12 fet controller that might run cooler, but have it set to no more than 25 amps.
You are aware, that very likely you see 1200w momentarily on your current setup?
To keep the controller cooler, run WOT more.
THE LIPO RULES. NEVER ABOVE 4.3V NEVER BELOW 2.7V DON'T PUNCTURE
Ideal charging /discharging range for Lipo, 3.65v minimum 4.1v maximum
See battery technology section, FAQ thread at the top of the page for lipo noob info.