Oh yes. This is big guys hobby

String beans cannot keep it straight

A little beer belly is like keel. You had at least 4 gallons or 20lbs too much weight. That might really cost you that 0.07sec dividing from that 6.xx time.
Belt guards are pretty heavy too and I have thrown them away. Of course they are for safety reasons and are not recommended to remove. Every single new part which I've made to bike is as lightweight as possible. But like you said there is point where almost everything possible is done and slimming is not an option for me too. Downhill skiing will suffer otherwise. Power adding is the next best choice. Bit expensive though.