Thanks for the photos. I would say that you have already exceeded my expectations with your designs. Either you have a great engineering program or someone has done the research on induced drag. It would be very interesting to put a racing engine into your designs instead of a mildly timed sport engine. You could easily touch 200mph with a Q40 engine or FAI engine, though I would stick with the Q40 engines (Jett or Nelson) because they are much easier to operate and APC makes carbon props that work well.
If you have good bearings, it is nearly impossible to blow up a .40 sized engine. Most of the top racing classes operate in the 25 to 30K+ range in the air, and the internal construction is not that much different from any of the sport engines. The mild sport engine timing will limit them to under 20K, but you want any engine to operate at it's peak power rpm in the air, so prop selection is key especially with flight profiles you are running.