If you want an EF-4 or softball size hail, you really want that hot, dry mid-level capping kinda airmass transplanted from the Plains/midwest. No secret lol
Yeah that's almost impossible. NE MA is a death pit for severe. It always dies here, today great example. unless it's along a seabreeze front and something really lucky with large hail/microburst stuff, this is the graveyard.