Cross check the chart I posted. It will only raise the effective stall by around 100-150 RPM if you can shave off 50° F.
A hot tranny runs around 250° and a cooler can only drop it around 50° (at best) and it will only change viscosity by around 7-10%.
Not enough to make the 2500 stall work properly in your application (since you are already at the razors edge cold), but enough to keep a 3500 well within the performance range by keeping from dropping below a 3200 stall when hot.