Vega red’s (they’re crap btw) was the spec tire for Rotax Sr a few years back, they have a stiffer sidewall than the YHC’s. The fronts are very sensitive to your setup; I’ve burned through a set in 30 IMI laps once.
I found the fronts like a degree or two of positive camber on the front (static setting, w/o driver in the kart), about 12 pounds of pressure all around and a wide front track setup. The rear’s last forever, it’s the front tires you’ll have problems with, and they seem to last longer at Bandimere vs. IMI.