I hate to bring this up, but the OS.77 connecting rod has been known to fail and most people that used to run them, replaced the stock rod with an aftermarket rod (no longer available).
Some people got away with running the stock rod in a Byron, but it almost always failed in a Dynamax. I knew a couple of guys that broke 3 rods in one day and they were in a Byron powered Regal Eagle. There was a guy (Col. Thacker maybe) that was modifying the stock rod and getting it to work without failing, but I wasn't using .77s by that time and so I'm not sure what he was doing.

As far as inflight needle, I agree with what's already been posted. An inflight needle is more important than flaps or flaperons. The Byron F-16 doesn't need either one. In fact mine acted squirrely when I tried flaperons so I went back to ailerons.

According to the Byro-jet Tuning instructions you should tune the pipe with a measurement of 11 3/8" from the glow plug to the largest part (diameter) of the pipe. These specs are for the #4 or #5 tuned pipe.

Good luck.