Cheap Schwinn trail bike, Shimano Tourney RD (just says Shimano on the FD), index shifting, triple.
I need to adjust the FD because it's sometimes difficult to shift from the middle ring to the big one -- I'm twisting way past the "3" on the left shifter and sometimes that still doesn't do it on first try. I rarely use the granny but it's no trouble shifting to that ring or to the middle one, although when in the middle ring it's usually between the "3" and the "2" on the shifter (closer to the "2," though). I don't really care that the numbers don't line up, I just want to be able to shift smoothly from middle ring to big ring.
1) Since the problem is with the big ring, I don't need to adjust the "L" screw, do I?
2) When I adjust the "H" screw, does the cable need to be loose (there's no barrel adjuster, just a screw to hold the cable in place)?
3) Should I adjust the tautness of the cable?
I did read the instructions at Park Tool, but I wasn't clear about the above. Thanks in advance.