We just purchased a Santana Tandem with the Ultra Gatorskins 700x25. The folks at Santana said we should run them at 140 PSI even though the max recommended is 120 psi. I'd sure hate to blow a tire due to too much pressure, but also don't want to pinch flat. Not sure if it makes any difference, but our combined weight is 325lbs. Any thoughts would be appreciated.