Good point and thanks for mentioning - it made me think
In my cart didnt find help from negative camper to the heat issue - it propably causes some understeer like you mentioned = tyre didnt get worked up = didnt heat up. Tried from 0 to little negative to a lots of negative. More negative just caused more tyre wear on inside and cold tear
I tested moving the seat front to back, up and down, battery to the front, several front stabilizers, high tyre pressures, different chassis heights. Some of these improved front tyre temps, but these solutions were not right, either the temps improved marginally or the kart became slower. Didnt find one single solution, that would set my fronts on fire until tested this toe out. Now I can add or reduce front tyre temp as I wish and run about recommended pressures at front. Im still running alu fronts though
For now - with this toe out have set the tyres to 0 camper unloaded.
Tyre wear is now equal across the surface