Ringosta

Hi..can someone advice on setting up my TA05. I am currently running a P2k2 superstock motor, keyence A10B (ESC) and Mars transmitter. The car runs quiet well even against HPI's and other chassis. I want to get more competitive - the simplest for me right now is play around with the gearing...right?....tamiya suggests the tune parts on the box(53833,53841,53842,53843,53847 and 53843)....these obviously come with a price. I would like to get an insight into this before I spend out...