"clydes should probably have 28 or 32 for the road), and that they are pumped up to their maximum pressure (hopefully 85 lbs or more, over 100psi is best)"
I would definitely disagree with this. I started riding at 315+ and have always ridden 23 cm tires. I have never had any issues with them and usually run them at their near max of 120+ (depending on the tire). I can't imagine why I would need a wider tire for road use.
I have seen this thinking posted elsewhere on this forum and am puzzled as to why people think Clydes have to roll on bikes built like tanks. I now weigh 240 and my legs are bigger than ever - even when I used to do powerlifting. So believe me when I say that I can put a hurtin' on a bike.
As far as the speed/weight question goes, I think the only place that weight matters for Clydes is in hill climbing. Descending is awesome
, flats don't matter, and the weight can even be a benefit when there are rollers. The only place I have gotten slower since riding (been on the same bike since I started 3 years ago - it weighs 19) is on the descents because I don't have as much weight pulling me down the hills. But saving a few pounds on the bike doesn't mean near as much as getting rid of the pounds around my waist!