So do you have a boost gauge? Going off wheel spin is too vague to diagnose, especially when you change tires. I would go off any changes in peak boost and how fast it spools. What are you doing for boost control? I'm just going to assume you are using a 91 classic chip from TT and boost is being controlled in the chip using the stock solenoid.
If you are saying that it is slow to build boost, then yes I would say that is a converter that is way too tight. Advertised stall speed is really not accurate as different companies advertise that number based on different variables. They may have been basing that 2200 on a motor putting out way more low end torque than yours. If you plan to keep the stock turbo, you want something that can flash to around 3000RPM in order to take advantage of the peak torque range on a stock motor.