Tactics Trainer Timing Suggestion

I see a lot of discussion about TT timing.  Obviously some people get very fast times, and it becomes difficult to get 100% even with a fast, correct answer.  I assume TT takes the average time to help calculate the percentage.  I wonder if both correct and incorrect solution times are used to calculate the percentage.  I don't mind going up against another player's correct answer, but I don't want my correct answer downgraded based on the "fast" time of a player who got it wrong.  If it's not already done this way, maybe it's better to give heavier weights in the percentage to correct answers (if not ALL the weight).

I realized it's the learning which is important, not the score, but the score is nice in that it gives me some measure of progress.