You have been lifting weights somewhat regularly for 25 years, majority 3x8-12, and the switch to 5x5 increased your dumb bell bench press from ~20kg to ~35kg?
There is just no way. That is extremely light weight. Like, most beginners who follow any sort of progressive overloading system will be at that level in 4 weeks starting from essentially 0
You have been lifting weights somewhat regularly for 25 years, majority 3x8-12, and the switch to 5x5 increased your dumb bell bench press from ~20kg to ~35kg?
There is just no way. That is extremely light weight. Like, most beginners who follow any sort of progressive overloading system will be at that level in 4 weeks starting from essentially 0