Glad to hear your out there making some noise.
I wouldn't get too concerned yet. I imagine if I went during bad weather and the track was bad on top of that, I would have traction problems too.
Usually in those situations I pull out of the burnout box, lock the line lock, and stand on the gas. I'm usually in 3rd gear within 3 seconds so the smoke starts fairly quick. But I sit there anyway. And I sit some more. And I sit a little more. Then I let off the line lock and roll it out, foot still to the floor. Sometimes if the tires start to grab I have to shift down to 2nd gear to keep them spinning. I roll it out as far as I think I can get away with. If your feeling really ballsy and the track is real bad, see if you can carry it past the lights and lay down some rubber for yourself. In other words, pretend your John Force.
By that point, if you still don't hook at least you had fun.
As for the gears, I've found that lower gears make breaking the tires loose easier, but the car doesn't carry out the burnout as long. It kinda just does it's burnout, hooks up and starts truckin. Where as with higher gears, you can carry the burnout half way down the track.
How do you have the rear of the truck setup? Just the traction bars and no other mods?