please don't take the posted replies as being a beating on you.
it's just that ALL engines of THE SAME combination[s] are SLIGHTLY DIFFERENT from each other, and [as member Cab says] REQUIRE TESTING, TESTING, TESTING to see what YOUR COMBINATION REQUIRES for it's optimal performance.
that includes ignition timing, carb tuning, and chassis tuning, and you won't optimize this in a 15 minute time period.
and believe this from an old dumb man, it took me years to understand and utilize information that is out there, and to separate the fact from the bull$hit.
please don't give up !
most on here want to help you, but [some] can't formulate their thought[s] into words that don't sound condescending or patronizing.
over the years i have been here, i have learned so much from everyone here, even if i didn't realize it at the time.
consequently, i try to pass on what i [think] i know to those that [may] need it. other do the same, but maybe in a way you may find issue with.
so please try some of these suggestions, and let us know what happens.