Thank you everyone again for the comments and compliments, I appreciate it!
With the FDE modification (the same one I post to this forum a few weeks ago) the only significant change I made was to the engine and prop data, and I don't recall noticing any difference in torque on take-off after these changes, though there may have been (I'll investigate further). The Texan itself doesn't sound like it has much p-factor or torque effect on take-off - it has a rather small prop (especially compared to the size of the aircraft), and with less than half the take-off power as something like a P-51. It was a big step-up from the Stearman, going from 220 hp and cruising at about 80-90 mph, up to 600 hp and cruising at about 150-170 mph. There are many reports of wartime pilots flying something like the P-40 for the first time, following completion of training in the Texan, and very nearly going off the runway before tackling the aircraft's tendancy to swing (of course after that first take-off, they would get the hang of it straight away).
The Texan is often said and shown to be an easy aircraft to fly. There are only two items that contribute to a 'reputation' for the aircraft:
1. Poor ground handling - with a narrow track landing gear, the aircraft is very prone to ground looping on the landing roll-out, and is the biggest area where a new Texan pilot can get into trouble - upon landing, you need to have feet that move. It can also be a challenge to taxi. (I don't know if something like that can be fully simulated in FSX via the flight dynamics)
2. Can snap on a dime - especially at low speeds, because of the slight sweep in the wings, the aircraft can snap very quickly when cross-controlled.