You can totally surf an x22. Check under 'wakesurf' and 'x-22' for old posts. I have a 750 in the boot, a 400 between the back seat and the motor box and a 400 on the back seat. All of them are as far to the side as possible. I have a 400 in the walk thru to lengthen the pocket. Think blindside used a 900 in the walk thru. I have no modifications to the platform, but it does dig into the wake, just can't be bothered as I can still surf as long as my ability allows. We surf both sides btw, just depends if regular foot or goofies are setting the ballast.
Pretty sure there are photos of the wake from other members, but I can't upload.
It is not as clean as a v drive or surf boats and you won't get waist high green water, but still heaps of fun.