I shoot more when the MVP is in my hands compared to my other sniper platforms. It's that comfortable to rip with. I use a 68/45 so I couldn't tell you what a 13k is doing for me. Only did it once for a bit and didn't like how cramped I felt. It IS regulated so I think you should get a fair amount of mileage from the 13k if that's the route you take.
Never touched a 22/3k so I couldn't tell you how that handles