As said camber doesn't eat inner edges toe does, you are quite correct they are trying it on with a refurb to cure the loss of air, I've had brand new never used before alloys that leak slowly, bead sealer doesn't work 100% but is better than nothing and that helps.
I have in the past let tyres down and used my fave instant gasket Loctite 5900 squeezed into the gap between tyre and rim, 100% seal don't lose a drop ever.
Different tyres will have a dramatic effect on tramlining, esp with a light car such as this.
I now use HANKOOK VENTUS EVO V12 K110 tyres zero tramlining, better than F1 ps2 so3 etc in every way, esp price, would be worth a go, but I would take it elsewhere for the tracking next time.
tabetha