I generally wouldn’t mix match tires either but I will say, having the car understeer more with the weaker tires up front has been nice for learning. I’ll have my square setup on in a few weeks before my next event.Not asking about the tires but I'm sure other will agree. Don't mix match tires on the track. As far as lap time I have no idea because I am not familiar with VIR. But have fun and be safe.