What you're experiencing isn't related to your assembly work, so there's no need to disassemble anything. The angle between the fence and table is adjustable with shims, and this is covered on page 8 of the LS positioner manual instead of the TS manual -
http://incra.com/manuals/LS_Manual_web.pdf .
The fence shouldn't tilt forward, but it's fine if it leans back a bit, and I intentionally set my fences to lean back the top a paper's thickness (0.002" - 0.004"). I don't spend a lot of time looking for perfection, as having the fence lean back doesn't affect the accuracy of any commonly made cuts.
- It's normally not necessary to unbolt the fence glides from the fence...just disengage their hooks and lift the fence while sliding toward you.
- I personally run a layer or two of masking tape lengthwise on the fence, either above or below the mounting T-slot depending on which direction the fence's angle needs to be adjusted, and snug the fence back onto to the end of the sliding carriage to check the angle.
- When I have the angle I want, I finish the setup and finally trim around the fence mounting bracket with an X-acto knife or razor blade for an invisible, one-time setup.
- Before you retighten the fence to the end of the sliding carriage, look at step 4 on page 8 of the TS-LS manual -
http://www.incra.com/manuals/ts_ls_manual.pdf. This will ensure the fence slides smoothly be letting those parts settle in to the best relationship before they're tightened.
As I mentioned, you don't need to unbolt the fence glides from the fence, but if you did, be sure to go through
all the steps on page 8 in the TS-LS owner's manual in the order they are shown to ensure that the fence slides smoothly. A stack of 5 business cards or playing cards under each end of the fence is equal to the thickness of the original cardboard spacers, but there's a range of fence heights that work fine.