RE: 3/4 inch groups ?
Don't be alarmed! if you went and watched these 3/4 inch group shooters you would find out they are not repeatable. In other words they might do it once and for some reason get it in their head they are doing it all of the time. NOT. If they were, they would be pro class by now.. Just put a 3/4 inch dot on the target and watch for all arrows to be in the dot. Won't happen all that often. If they could do it regular at 20 yards they could go to Vagas and shoot a clean round (300). Well I don't see them there so the 3/4 inch group thing is usually a figment of their imgination.
Your grouping sounds good to me, I can only wish that all my arrows are in a 3.5 inch circle at 35 yards. In fact only some are and some are not.
Consistant form and consistant executation of the shot routine is condusive to accuracy.