extremely soft 2nd to 3rd shift

thank you for your reply harlydartguy, while i was on my linch break i re-adjusted my throttle valve cable, pulled it out a little bit more. And i took it out on the highway and 1st to 2nd shift was alot firmer and 2nd to 3rd was firmer as well but i had to let up on the gas pedal to get it to shift into 3rd when i wanted it to, but the 2nd to 3rd shift is alot firmer now, wich is what i like. I dont like that real hard tear your head off shifts and i dont like the soft sloppy shifts, just a nice noticeable firm shift is what i'm after.
So since i had to let off of the pedal to get it to shift into 3rd when i wanted it to does that mean i have to drop the pan and adjust my shift points? And i sure wish i had a pressure guage, but i dont. The technician who was in controll of my re-build told me that the shift points and the line pressure were all set to factory specs for my transmission. And this transmission is in a 1991 dodge power ram 150 4x4 truck. I'm sure factory line pressure setting for the A-518 in 1991 is probly fairly low, at least i have been told factory settings are normally too low. Thats why when i had the pan down i increased the line pressure screw by one turn and to be honest i can hardly tell if it made a difference, maybe a very slight difference, how much can i increase line pressure before i'm in a danger zone? I went 1 turn out (counter clockwise) from what the transmission shop had it set at, and according to them it was set at factory spec.