Yep. Stick with the factory 20s and 30s and all will be well.
The 20s have a very slight curvature. Best part, Ruger had them on sale earlier this year on their web site and many stocked on them at a good price.
There are currently no factory 20s or 30s for the Mini 30 that I know of? Do know it's even harder to find functional hicaps for the Mini 30, than the Mini 14. Two that I have (USA), are absolutely useless. The lip at the front of the mag is too low to line up with the chamber, so the cartridges cannot feed properly. Iffy feeding on FMJs, zero feeding with HPs.