Never heard of ultra-thick condoms, but personally...without one I never last really long..if I keep the same pace.
If you can summarize it:
1.get yourself a classic condom
2.change your pace pretty often
3.USE YOUR HEAD!! if you keep staring your thoughts at your dick all the time, you're gonna come faster..during love, try thinking about something else than your shaft, it helps. (No one needs to know your trick, but i think that's a good one

)
When you put yourself into it you can really make it longer, and then even try to reach orgasm simultaneously, wich is something delicious.