20150+6XL+4S lipo = OK?

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Would a 20150 and 4s lipo run more efficient and cooler than a 9920 with 4S lipo? Right now I run the 9920, 7XL and 4S lipo on my Emaxx, and after 10 minutes or so it gets pretty hot -- near 165f. I did run an MGM 16016 and it ran much cooler while it lasted, I liked how cool it seemed. Would the 20150 be similar that way? I am going to add a fan to the 9920 and that should help, but I do have a Nemesis 6XL sitting around I would love to run in my Emaxx. The little bit I tried it, it made that thing really scream! Seemed much more gogo than the 7XL, but it would only go for about 3 minutes before the 9920 shutdown. I'd really hate to fry a $500 controller, but I would really like a smooth running bulletproof setup, if there is such a thing that is...
Thanks!
--JD

I run 12/51 mod 1 w/40 series mulchers, UE diffs fyi...