176cm is from 143 lbs to 176 lbs and the 186s are from 154 lbs to 198 lbs.

I think I solved the mystery. The ratings for the 176/186 length are what are actually marked on the skis. Looks like Fischer didn’t bother to update their catalog. I’ve heard the 2022 T78s, and probably others, are made by Atomic due to a fire at the Fischer plant.

I'm struggling with a similar decision on the T78s. I'm about 165 lbs. without boots. Trying to decide between 176s and 186s. I'm finding some online information to be inconsistent. I found one site that shows the weight range for the 176 to be 143lbs to 176lbs. and the 186s to be 154 lbs. to 198lbs...