Not a racer and certainly no shaping expert but...
The primary control for twist is sheeting angle - Forward sheeting reduces twist due to a more "downward" haul.
Barberhauling, Backstay tension and even halyard
tension also affect twist. but they also affect power and pointing ability.
I know this is a new rig to you and it might be normal. One of the other Catalac
owners might chime in. However the telltales are the key. When close hauled and trimed right all the telltales should stream together. As you slowly head
up, all the windward telltales should stall about the same time. If the top one stalls first you have too much twist.
A vertical crease in the leech sounds like there is too much vertical tension. I'd look at backstay tension if it were me. Looser backstay = less twist.
Here is a great primer on Genoa shaping.
Genoa Fast Course