I use a Protector Dr Flattop 3/4 inch spacing
Best is a edgewood gator, 3/4" spacing 1.5" ears. This rifle has the same shape in the rear as the st-1000, I'd say it tracks.
Call Protektor and ask to order a Shehane bag. You can customize it to your preference such as ear material, height, length, placement, etc. Nice thing about the Shehane bag is the minimal footprint and the rear is tapered for shoulder/arm clearance. The problem I have with the DR bag is, it's way too big and awkward for me to reach around it the way I sit. I know this is not an issue with everyone, but something to keep in mind. You have to make the bag how it's comfortable for you. After you go through a half dozen bags, you may get one you like, lol.