Hello everyone, my 92 lwb 2.5 is running great

I just put in a boost gauge and a exhaust temp gauge to help make sure it keeps running good, i also upped the boost to 12 lbs. But the transmission is shifting late it likes to run up high rpm unless i pull my foot almost off the gas. and then overdrive if i put my foot in it just a little (like for a hill) it wants to shift down to 3rd. Is there any way to adjust this
I did adjust my tps and it helped a *little* but that could be in my head also
Any ideas how to get it to shift better
Ohh all fluids have been changed also (1st thing i did)