Actually, I don't weigh my planes but I didn't have to put as much useless lead in the nose with the 4 stroke as I did with the OS .50 that was in my first one.
The Miniplane is pretty forgiving and lands pretty easily. I covered my first one (.50) in Coverite and painted it and it was much heavier than my second one (.46) covered in Monokote. My third one was Monokoted and had the .70 installed inverted. They all flew fine, the .70 obviously had more vertical and sounded cooler. It is a draggy airframe so keep a little power up on final until you know you have made the runway.
I have a NIB kit here...you're making me think of getting it out...stop that. I have too many projects in the pipeline already.
Don