its commonly stated that the grip should be big enough that your index finger can fit in between your fingers and palm. so i automatically bought a 4 5/8 grip thinking this was correct. but then today i fit with a 4 1/2 grip and the racquet felt more like a toy. and i say that in a good way. it felt more manueverable, i could spin the racquet better, and i got more torque on my shots, im seriously considering switching to a 4 1/2 grip size. is this a smart choice? what are the advantages of a small vs big grip?