In this situation I agree with Dennis L.
Unless someone is working to win Open stunt at the NATS, and actually just enjoys flying a C/L plane, almost any engine can not be ruled out. And there are a lot of engines that work great that get overlooked because one, or more, top level guys say it is too heavy. Getting the model balanced at the right point, and getting it trimmed to fly the way the pilot likes is the most important factor in these situations.
So, if someone already HAS a .60FP or .65LA and isn't looking to competition at the top levels using these engines makes good sense.
BIG Bear
RNMM/AMM