Did you drain the torque converter? A lot of these cars don't have a TC drain. The pan holds just about exactly 2 qts.

I use a dip tube to check the level...just a 3' length of small diameter nylon tube. Push it down as you would a dipstick, then put your thumb over the end and draw it out. Air pressure will hold the level in the tube, and you'll be able to get an accurate reading. That doesn't help much without a reference, but the pan is about 1.5" deep, and the level should be just below the gasket. You can get a more accurate estimate by measuring the height of the pan.

The only cheap possibility is a broken K2 accumulator spring, although that would more likely give you a flare followed by a harsh engagement. Do a search, there should be a photo guide somewhere here. You may get some temporary relief by using a viscosity modifier additive, but this condition is usually progressive no matter what you do. I know you don't like the answer, but this transmission likely has a worn out K2 pack or K2 seal. It's going to need a rebuild.