I make up a cleaning solution of 50/50 91% isopropyl alcohol and summer blend car windshield washer fluid. When I swab a take a wet patch and in short strokes work from the muzzle to the breech. Then turn the wet patch over and do the other side of the patch. If it looks like you have a lot of fowling run another wet patch. After that I run two dry patches to make sure all the moisture is out of the barrel. Then load as normal.
The vertical stringing could be from a poor swabbing regiment, it could also be from poor positioning of the forearm on the bench rest. There are many things that could cause that. I do not know how you worked the load up. I normally start at 85 grains of Triple Se7en and then work upward until I get the best group.
You might also want to try a few different projectiles. Perhaps your rifle just does not like the XTP's although my Knight rifle loves the things. It also likes the 250 grain Barnes Expanders. With those, the rifle will shoot some very impressive groups with the open sights. When I shoot XTP's I normally shoot the 240 grain, but that does not mean your rifle will like them. All rifles are a mystery to themselves and must be figured out..
Good luck with the rifle.