My kart is probably going to be around 150lbs, with occasionally over 300lbs rider and tow (I'm gonna hook up a bike trailer to tow my kids in), 3800rpm max, and 16" tires. I have 6:1 but after reading a bit more that seems like it's not enough. I can find 80T sprockets giving me 8:1, but they're about $80 or more. Would it be better to do the extra work and install a reducer of some sort, or make my own reduction with a live axle or such to get a better ratio? I could also get a 9T or 8T drive sprocket, but someone told me that few of teeth could be hard on the chain. What's my best bet?