ONly thing that matters is that you're happy with what you're doing. The only guys that are charging at higher rates are all the stock guys because for mod it makes no difference. Stock guys are trying to gain every advantage they can get and yes you do get more punch by slamming your batteries with a 40 amp charge. I use a iCharger 410 Duo and I discharge at 20 and charge at 20 on a cycle. I hit the button once and it does it all for me. I haven't found a need to charge at 40 yet for our local club racing and big race events as I am able to keep up with sportsman and expert classes.

Again if you're feeling good charging at 5 amps then just continue to do so. You will feel a difference though if you decide to bump up to 20+. Shoot these guys are charging at 70 amps now with these new plugs its crazy