People fear of loosing the excitement of going powerful fast. I have runned many classes, even with a simple Nikko car we had a lot of fun racing all with equal low power.
Going for a hotter plug will do something but the best advise is to take out a shim, lower the head by 0.05 or 0.1mm because with the smaller combustion room a less power combustion will bring back some power compared with no compression change.

In a large FB nitro bashers group people are screaming about a dying nitro hobby and how stupid the EU is but no one ever tryed 16% The stupidity is even bigger when the mods also say it is stupid and you should fight against it. Face it, there is no way to fight against it. Yes, it will affect the bashers too who like to run as much nitro as possible but you can be mad about it or you can just advise the right way what to do to run on 16%.

Here a guy who tryed to explain it all but will not face the 16% change, he will try to postpone as long as possible. But look the reactions under the video. And this rule was already known 2 years ago.... (also the reason why the EFRA did not want to change back to 25% with a proposal at the 2019 AGM)