I have a grp valley fitted and I'm getting water behind facia board at bottom valley. The things I can see that are wrong are valley kicks up at bottom and battens push into membrane causing it droop. Also roofer has not done v cut into gutter of valley and has left straight, hence side channels of valley end on top of fascia. Also tiles on both sides of valley at eaves also kick up too much. I was thinking of cutting fascia boards down by say 15mm for example so tiles on both sides valley slope more and also putting v cut in fascia for valley to sit Lower,also put newn1m piece valley in at bottom. Any thoughts guidance?