1) I'd say a one turn motor difference would be the best option, but also take your battery C-discharge rate in consideration. I don't now what C-rate you're running know, but say you were running 35C Lipo's and you would make the switch to 60C Team Orion Life's you might not need to change a thing.
2) in my experience, Life efficiency is great, probably the same as Lipo. I have some cheap 4500 Life packs and one goes from GREAT-GREAT-GREAT-GOOD-DONE and the other goes GREAT-GREAT-GOOD-GOOD-DONE. Believe me, I used to run nimhs not long ago, and they are nothing alike.
3) I only know of one life saddle pack and it's the team Orion one. I have no idea if it will be homologated, but their stick pack is, so I think there's a very good possibility.
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