The carpet that is used at the club is very high quality Prima gt as far as I am aware and cost thousands originaly.
It came from sharly park so was originaly used for 1/12 pan car so there should be no problem there.
I think the problem is it takes time for the additive to build up over the night and bring up the grip levels.
And with the smaller amounts of onroad at moment then there's less additive going into the carpet.
Every clubs carpet with have the same issues as far as I am aware.
Even when I raced 1/12 you started on different compound then as grip came up went to another one to compensate.
Other than that I hope you are still having fun racing