The sloped r10 cheek piece isn't helpful if you have low mounts, you ha ve to stretch forward onto the lower part of the cheek to allow good sight picture. Not good if like me you have a short neck
If it's any consolation alot of people struggle with that particular stock. So its likely to take a bit of tweeking and range time to get it how you feel comfortable.
If you are primarily shooting hft then youl be best to set it up prone.as 90% of your shooting will be. If you have to compromise ,make it on the lowest amount of positionals