Those percentages only change from doing rated puzzles as far as I'm aware
custom puzzles % is not going up

It is my understanding that playing Custom Puzzles will not improve your score. The numbers your see on the Custom Puzzle page indicate how you are doing in specific subject areas.
Custom Puzzles allow you to practice in selected areas, and then you may return to playing Rated Puzzles and hope to improve your score.
You will still need to win more than you lose in order to increase your score. I think it becomes even more difficult to increase your score as you play more games. If you have played 100 games and have X-average, it will be easier to increase that average. But if you have played 1,000 games with the same average, it will be more difficult to increase that average.
Then as you play and lose more difficult puzzles, that will plunge your average even lower when you answer incorrectly. It seems like a vicious cycle.
I could be wrong of course, but the above is how I interpret this situation.
i do about 7 puzzles a day and the custom puzzles i have been doing them for about 7 months and the % is not going up or down
20% AND I HAVE BEEN DOING THEM FOR 7 MONTHS
ONLY 5 PUZZLES
i don't have a premium so i get three puzzles each day for customs AND STILL HASNT GONE UP PLEASE FIX THIS Chess.com