Yes 5000 mah lipos will be better, I use Thunder Power Extreme 5000 mah. The Extremes have great power and give me about 150 watts more than my older 5S4P Prolites did, and weight about 4 oz less. Yes flight time has decreased but the older Prolites (which ran cooler than the Gen 2s but still got hot) would get hot if I ran through 7000 mahs of the 8000 that I had, especially in the summer months in the desert.

When I first started flying the 22/30/2 and midi I was getting about 850 watts on the first generation lipos from Thunderpower, around 55 amps. I puffed a couple of rows of cells from flying too long. Each generation has run cooler than the last, and finally with the Extremes I lost some weight and the packs are cheaper. I only fly 5 minutes max vs 7 before but my batteries no longer boing and I get almost 1200 watts at the start of the run.