Honestly based off the original post, the Covert is a must with your favorite pin down layout. Anything to get that ball rolling slow down lane makes it the perfect option when lanes get cliffy or tricky overall. Its a good strong slow rolling orb that ive depended on since ive got holes in mine. (never had issues with it burning up, even with some surface)
For the high end shiny, I don't think you can go wrong with a Inception Pearl. Its the perfect middle ground between a quick high end asym shiny but still a controllable big ball motion.
If for any reason you want more options, the Dream On is a nice option as well as the Original Truth Solid/Pearl. Either one of the OG Truths are super good benchmark pieces that work well within the line if you can find one.