ok I just increased my oil pressure now it drops down to 50psi rather then 40psi when vtec kicks in
I have only just driven it once since the change but it didnt drop out of vtec
on normal driving its about 65-70 psi
and idel about 25psi
so we are pretty simular now with our readings

Tinkerbell - have you inccraesed your oil pressure from stock? stock pump? stock tention on the piston spring?

I now have 3 washers on mine