I can't make it through a whole season without destroying a drytop, though I've never had the flow to buy a super nice one.
First, check it for leaks. It is sometimes hard to spot a hole, and even one smaller than a pea will make you clammy. You might try using a light, like a flashlight or headlamp to make this easier. I got a few from charging through a barb wire fence last year.
If you find one, use aquaseal and a patch and it will fix great. If you think the seems are leaking seal them with aquaseal too.
Even if the fabric doesn't bead off water it still should keep you dry, or mostly dry. Sometimes it will get clammy, but that's different than feeling water running down you back. I would say, if you are getting wet, and not just damp, you have a leak somewhere.
Lastly, two years is a good run. If you have the cash, you might find fixing this is just not worth the effort. Particularly if it is not a high end top. If you not a dirtbag, and have a job that pays well, just buy another. You might spend hours trying to patch a leak, so ask yourself it that is worth it to you. Especially when tops are on sale now. Alot of people I talk to recomend the high end tops. I can not afford them, so I go with whatever I can beg or borrow, but never steal. This means I go through about one a season, but I also paddle everyday from march till june, and seem to space hanging my gear up.