I have a brand new HRX217HYA that I purchased to replace my aging HR215SXA. The mowers appear very similar except for the transmission. My old model (a 3 speed) was almost faster than a comfortable walk in top gear. The new mower seems slower in the fastest setting on the cruise control. My owner's manuals rated the old mower at 3.1mph while the new model is supposed to go 3.6-4.1mph; however, it feels much slower in actual use. Is there any easy way to increase my top speed? Will tightening the cable on the speed control accomplish anything? This is my third blade clutch Honda and it's a great mower but I'd like to go faster.