I was thinking maybe someone might benefit from this technique. Personally GTG does not work for me and just cycling through week 5 to 8 or 9 to 12 not always helping.
But this high volume routine work every time and not just for gymnastics. I used it for every exercise I needed relatively high number of reps and was stuck. It helped every time. Recently I used it to overcome RC PE4 plateau. It is definitely not my invention. Once for week is generally is enough for me, but if you have fast recovery you can do it x2 per week, x3 is probably not a good idea but you are welcome to try.
Basically the idea is to take the number of reps you need to execute (50 total, 5x10 for RC PE4) multiply by 2. That would be the number of total reps you have to perform. Then do it every minute set number of reps until you get your total (100), 25x4, or 20x5. Something you know you can do without failure. If you did 25x4 and did not fail even once then next time you are trying to do 20x5. If at some point you fail to do 5 reps then you continue working lower number per set until you do your 100 total. And so on.
In my case once I was able to do 14x7 I passed RC PE4 mastery. I did not do mibility every minute, instead I did it every 2-3 minutes. But moblity was not a problem for me with that exercise, strength was.
Hopefully it helps someone. Just something to try if you are stuck for a long time and cycling through weeks progression does not feel like anything is changing.