So quick tips.having problems with ordinary set up
first of all - trim. Horizontal position is the key. If you have the position of a sea horse you will not be able to reach valves.
Second thing - always keep your head up
Third - make sure your elbows are really close to your head and parallel to it. If you put elbows even a bit aside - you will not be able to reach velves.
Wish you the success