Your motor might be weak but it might also be attributed to Tamiyas. I noticed MUCH better trigger response once I switched to a 7.4v lipo 2 cell battery on deans than tamiyas. The battery also lasts longer on deans rather than tamiyas just because of the extra surface area for contact.
If you're going the 3 cell lipo route with deans I highly recommend rewiring the whole thing even if you don't go on a MOSFET. Grab some nice 16 gauge wiring and wire them to deans and your motor might be able to get some new life. If you continue using what sounds like stock wiring with tamiyas and a high voltage lipo you might as well replace the motor now since it will be toast after a few mags.
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