The float needle valves are just underneath the float, right by the floats hinge point. I wouldn't set the float height until you verify the condition of the float needle valves. Look for wear at the tips of the valves and if they're rubber tipped, look for deformation. I'd plan on replacing them.
I don't know the float height specs right off hand, and I can't look it up on my PC either. I'm having serious tech problems. My PC is barely limping along. I suppose if someone here will suplly you with the specs then you could verify it and rule out that possibility. I just didn't want you to go through the process and reset the float height, thinking that's all that's necessary, when it's a good possibility that the FNV's need replaced.