I had some 31 A/Ts and they were horrible in the rain - mind you i bought the Jeep with them on, so not sure how many miles were on the tires - they looked pretty sorry though, so they might do better new. Changed to 33'' M/Ts and these are definitely much better in the rain.
To try and answer his question "Is there any tires on the market that dont hydoplain?" - no, any tire will eventually get to the point where loses the contact with the road, but there are some factors that make them better or worse:
- how heavy it rains at the time and how much water is on the road (considering that the road is nice and there are no tire grooves where the water would accumulate - that makes it worse even on light rain)
- the wider the tire the more likely to have aquaplaning (for the life of me i'm not sure if that is supposed to be a double "n" or not and i tried to stay away from the hydroplane one) and since we are all running 9''s and up (i think, not sure what the stock width is) we are exposed to this phenomenon
- it also varies with speed, so the faster you go the more likely your tire will start waterskiing, so a cheap remedy would be slow down in the rain;
- it is also affected by how aggressive the thread is, the deeper and wider the grooves the better will "split" the water surface - so i guess you could also buy some good tires with real aggresive thread suited for heavy rain (prolly the Mickey Thompson Baja Claw look like would get rid of the water pretty quick
http://mickeythompsontires.com/truck.php?item=BajaClawRadial) but give up some of the hwy comfort (which i don't think many of us care, well at least some of us don't care i'd say); i don't use these myself but the thread looks like is meant to disperse the water just like the racing intermediate tires.
As i mentioned at the beginning, i use BFG Mud Terrains, they have been quite a bit of improvement over the previous set i had and they do ok in the rain - i think it has to do with the aggressive thread on them, but they are 33''x12.5'' so when i say an improvement you can imagine how bad the other ones were.
Oh, and i ran stock gears (4.11) with 33'' tires - was ok, but 5th gear only downhills and with favorable wind