Have you dialed in your weight/psi according to the tables for your tires? What chassis do you have?
I just went the other way. My 2002 Suncruiser has a W20 chassis and I just went from F to G since my understanding is the W22 is the same as a W20 but with load range G tires instead of load range F. I have a 500 lb wheel chair lift so I wanted the extra safety margin with my toad even though I was still within the F load range. I put Uniroyals on mine.
2002 Itasca Suncruiser 35U