I'm 190 cm tall and have quite long arms. It feels like the stock is a bit short for me. I notice that I mostly don't press it against my shoulder when I shoot, which should in theory lower the precision.
If you look at this picture, there are a gap of about 5 cm between my shoulder and the stock (green arrow).
The picture is a bit stage, and the scope is not placed correctly (it shook loose today), but it felt good holding the bow like that and it is quite close to how I usually hold it.

I once learned about rifles that if you hold stock a stock of correct length in your elbow fold (don't know what it is called in english, fossa cubitalis in latin

It seems to me that I should make my crossbow stock about 5 cm longer. Do you also think so or should I change the way I hold my bow instead? Any thoughts or tips on how to do it and with what?