i shot an SQ2 for 4 years. the best group i can remember was 5 arrows touching, in the X ring, at 40 meters. i robinhooded an arrow at 50 meters. and i shot 1170 the first time i shot a FITA event, the first day i shot 70 and 90 meters actually.
i had the bow setup with V bars, and a 30" stabilizer. but even with a pin sight and a short 12" stab, i could get 2-2.5" groups at 40 meters on my good days.
so, short bows are very accurate. i think any short bow is more accurate than his owner. of course a longer bow will be more forgiving, but if you do your part, the bow will do its part also.