Consider this.
Pt6-67 in a 1900d. 200 hours between service.
Pt6-67 in an 802 air tractor 100 hrs betwen service.
Now consider this. A gami injector are set to an engine to a much finer tolacemce than a standard injector although now this is much less than earlier engines.
As you said earlier leave the piano playing to the people that know. Go get some lessons if you won't to play with the big boys.