Have you been watching the transmission temperature? Thats the only thing I'd be worried about in doing something like this. I haven't seen it mentioned, but I thought that was the reason most transmissions dont always have the torque converter locked, in high load settings it causes a ton of heat.
I have a trans cooler on my car just because of some light towing and its cheap insurance. I believe 100 degrees above ambient is the quoted prime number.
Great numbers though!