If you have difficulty getting the proper trajectory in height then, you did not load the shaft properly. Too stiff for your swing maybe ?
The VS339 v2 in stiff was smooth but too soft for my past swing. If I'm not careful, a high curved to the right will result.
Maybe it'l fit me fine now..... LOL.
If you can, slowing down ( a quick pulse ) at the top will enable you to hit just about any flex withing one flex of your normal flex. Up or down. Like set it, then, let go. A trick taught by many of the good instructors. The split second pause enable you to feel the head and allowing the shaft to recover before starting down.
I just got a couple of new shafts for hybrid h1 and h2, can't wait to assemble them and try them out.
Only if the rain stops.