I don't understand why TT Cap needed when players solo.
The TT solo cap was 100 when its under lv100, even player's lv is lv1.
Personally, I think you just kill the best part of DR by putting cap on TT after lv100 solo.
Leveling TT solo is fun.
I do think TT cap after lv100 Leeching is needed but not for solo.