shrek

15psi will tear the tyre too shreads, I run between 5 and 8psi with the MT-43. Give the MT-43 a go, it does not squerm at all as the sides walls are much stiffer then most trials tyre and it is a much harder compond. Don't be scared to run low pressures with it, I'm around 135kgs fully kitted up and have never had a flat using one.

What psi were you running? The MT-43 is 100 times better then the others for enduro type riding.