I used to ride 28mm Gatorskins at 112 - 115psi and they were pretty comfortable and reasonably flat resistant under my 235 pounds. If you already own them, keep them. They're good tires.

I only switched after deciding to move up to 32mm tires with higher flat resistance based on a series of flats I got over the winter. Gatorskins tend to pick up more pointy crap when it's wet out, and those little shards can sneak through the belting layer and cause slow leaker flats.
Just one guy's opinion though; and I still give them a 95% approval. They were more good for me than bad, definitely.