Having to grind the ends off the mounting crews is actually a good thing. It means your getting rid of the part of the screw that doesn't actually help hold it in place and you don't have any extra space between the end of the screw and the bottom of the screw hole. As long as you don't have to grind off 2 threads to make it work that's the way I like it. If I was going to do anything, I'd have it turned into a 6 screw base, although the 3030 probably doesn't need it, it couldn't hurt. I'd guess there is a maximum depth that the screw holes can be cut before they can effect safety, so before I'd have a local guy make them deeper, I'd grind the screws off.
Not sure what you mean by "stud screw"
Bill