Everything is a balance. It depends on the use of the sled. More trail riding... leave it alone... maybe change primary clutch spring, weights. Radar runs are a bit different setup. You will not lose" A LOT "of bottom end response. IMO if you want to gain a few mph in 1000ft. change your gearing. If you are happy with 65mph in 1000ft and let's say the slightly taller gearing yields 67 mph... you have to decide if it's worth it to you! A gear change will not get you 5 mph in 1000ft. Changing gear ratios is not difficult. If you like to test and tune... bring a few options to the radar runs. Tory