I have more experience with MDS than I care to admit. Break it in with at least 10 full tanks before you fly it. All RPM's. Leave your idle high because with a bipe, you need it anyway as it will slow down quick.

Actually, the 46 LA will fly it just fine. Not a powerhouse but with authority. With the OS it will be capable of 98% of the standard aerobatics. Plus unquestionable reliability.

You have two good acceptable choices that you currently own. Keep an eye out here in the swap shop for a deal on a more powerfull engine, meanwhile fly it with what you have.

Good luck,

Mike