So I have a Novara Randonee with a Shimano RSX 3 x 8 group. I does not shift properly on the front triple crankset. It does not like to shift up from the small to the middle chainring without an extra little nudge from the shifter. Shifts to the large chainring and back down all 3 fine. Any adjustments I make to the cable result in shifting to the middle fine but then it will not shift down to the little at all. Shifters are all lubricated. Cables wires are new. Housings are not new. Front derailleur looks aligned. I'm gong back and forth with the barrel adjuster without relief. Any ideas?