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Another (free) solution to think about is driving inputs. Shocking, I know!
I have almost always tracked cars with street suspensions (including the 1er). Stiff suspensions let you get away with sharper inputs because they don't allow as much weight transfer. But if you do the same with softer suspension, the extra body roll will create the positive camber that hinders your grip and overworks your outside tread. So yes, you could try stiffer suspension and improve tire wear that way (not cheap). Or, you could try modifying your driving inputs to be extremely smooth to minimize the weight transfer and improve your tire wear that way (free). Remember: "He who turns the least, wins."
And none of the above means you aren't already smooth (impossible to say without riding with you), but we all can almost always be smoother. If there's anyone at your track days driving fast on a street suspension, I'd highly recommend chatting with them, following them for a few laps, or riding with them if they'll let you tag along for a session.
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