I gave TD-3 a try a while back; also ended up with EI 12 and no particular advantages in curve shape etc.(posted 8919 days ago)Lately I've tried Ethol TEC with a couple of rolls of TP; TEC 1:15 (not the recommended 1:31) 6'/68F EI 50. At first I thought I'd made a mistake, but a second test confirmed EI 50 for .10 DU above fb&f with a reasonable CI and curve shape.