Billy Goat
WKR
When my bow isn't tuned, my mechanical heads still follow my fixed heads so not sure how "not" tuning would fix anything using mechanicals. Anyone that thinks their mechanicals fly just like their FP's should shoot a bare shaft FP and bare shaft mechanical both from 40 yards and see what happens.
That could very well be your experience, but isn't always the case. Likely an effect of your long draw. Take a shaft down to 27" and it's not uncommon to have a mechanical hit within reason of a field point while the fixed blade planes off in another direction. I have seen it happen a lot. I have also seen where a mechanical hits in the same direction as a fixed, but not as nearly as far off.