If you want less sleet you seem to want either the primary to die early and coastal to form well south of the area (best case scenario for NYC and points south and east) or the primary dies out and coastal is weak and it's snow to a dry slot, the rgem has a pretty strong secondary tracking close to the coast hence the prolonged sleet, at least that's how I'm reading it. Personally I wouldn't mind prolonged sleet vs dry slot but if you don't want sleet you probably want a surpressed and south secondary I'd think.