The pressures look ok. What is the temperature at the a/c vents?
Keep in mind on these R-12 to R-134 conversions you just don't get that freezing you out of the car effect like you get with the old R-12 gases.
How does the a/c system feel when driving the car? If you have a fan, face it to the grill so cool air is blown against the condenser. Sit in the car and feel how cold it is. Also, check the pressure while you do this and record the pressures. See what the differences are.
Forgot to ask; was the system evacuated before charging with freon?