I had the chance to try TSTs in 183, unfortunately only for one run. To be honest I was a bit prejudiced that the size was big for me, but as soon as I got the skis under my feet and saw the tip rocker I realized that 174 would be short. The ski's weight surprised me, 183 TSTs are definitely lighter than my 160 slalom skis!
Snow conditions were chopped snow on and off the groomers, the ski's main feeling was CONFIDENCE everywhere. The stop and go feeling over the chopped snow vanished, everything felt sweet and smooth inspiring confidence to explore the whole mountain and focus on skiing technique. The tips were a bit ''chattery'' on higher speeds but nothing to worry about. OTOH these skis require a bit more effort to go from one side to the other in comparison with narrow- waist skis on hardpack, but for 102mm underfoot I think it was very easy.
Still haven't had the chance to try the 174 but finally I agree with your recommendations that 183 is better suited for someone like me. I' ll also ask for the dealer's opinion but I think I found my skis.