wait, I think that I can do the math:
1 bar = 14.7 psi so...
.68 bar = ?
it's a simple proportion soo
1 x ? = 14.7 x .68
divide over the 1 and:
? = 9.996

your pushing 10 pounds!! you should easily hit low 14's if not 13's. I ran 15.2 with 5.5 psi non-intercooled. What do you have done internally and what do you have for engine management?
thanks, and good luck,
aj