I’d call it a good experiment! Look at how often the 1k attack works at the pro level - hardly ever!!
Cat 4/5 can be tough and frustrating. People are at all sorts of fitness levels. A lot of the guys that would win cat 4 often have cat 2-3 engines. They blow through the 4s in one or two seasons grabbing a lot of podiums and then they would move on to become pack fodder in the 3s or 2s. If you have a cat 4 engine, it can be frustrating because you need superior race craft to get the podium.