Glad you posted! Welcome!!

You're not gonna want to hear it, but the "prime directive" is "Don't add weight if you can move weight." If you did a clean radio installation forward, I suspect you can do one aft ... Adding dead weight to an already overweight airplane should be avoided like a date with your sister's homely best friend...

If I may crunch some numbers, you're adding 12 ounces in this version... My calculator says that's a 10% increase in weight on an airplane that is already 17% overweight... total obesity is about 27% above the max target weight... That's a lot... (I must admit that am unfamiliar with "real world" weights for this airplane - hopefully someone who flies model will chime in, but those numbers got my attention, and I have nothing at risk)

The new engine doesn't appear to add power commensurate with the additional weight, so the power loading (hp/oz) is gonna go down, the wing loading (oz/sqin) is gonna go up... trends that make me nervous...

If it were my airplane, I'd be looking to reduce weight, not increase it... [] HTH

Cheers!

Jim