Andrew, Nice work there, Looks like you have plenty of space there to test drive in. I done 4 miles in my carrier today and had a similar issue with the brake drum seals, I dont know what the sealing arrangement is on a T16 carrier is, but its worth investing in a an infa red heat gun, if you have brake/seal problems you can use it to pin point the problem, my graphite impregnated seals are just packed in a little too tight (120 degrees) measured after 2 miles on the seal rim, without the gun i would of thought the brakes were binding, but its the seal generating the heat. its a quick fix too bed the seal in once you know what the problem is.
kev.