I also rented the L100 irons and similar "deviations" could also be said about them, I think it largely depends on the type of ball that is used and how you play that ball with respect to your approach for landing and releasing to the pin or trying to stop your shots dead or maybe even spin back a bit.
This is probably why it appears some of the top players playing irons of similar specs, seemingly club "up" when using full BS because they lose distance when doing so and it is necessary to play an extra club in order to get the desired distance to the pin. Just because a club is rated for 210 doesn't mean it is going to play 210y with full BS. This may not be how you were playing it, but it can account for the differences at times.
I didn't feel the L100 irons played qualitatively better than the L97 irons or at least from what I could tell. They are slightly more forgiving but with the slightly quicker meter you may be dinging fewer shots. As a result, for me anyway the two played similarly to one another.
I opted to keep my meters speeds the same and stick with the L97 irons.