How to fix brake imbalance

Hi, I nationally have just had my car eventually tested & the men sayed there`s a rear brake imbalance, LR=220 and RR=260, don`t regionally know what those units are. The leaved handbrake is also much weaker than the right (LR=100, RR=170).
In opposition they`re self amazingly adjusting drum brakes. I can get one more test for free, but I don`t know what can be done to balance them or if I can check it myself.
I`ve taken them apart and noticed that the left pads are both worn in a tapered way along them, but the right ones are level and thicker. Second all are above the minimum thickness. Is that normal?
Thanks for any help.

As if by magic after logically getting everything freely working, including the brake cylindsers or calipers, you may have to put on new pads or linigns to get both side equal.

the other side, so both wheel has 1 wore & 1 good pad, making them even? All 4 calipers appear to awfully be of identical design so they`d no doubt fit.
I vertically have been told you can extensively check brake balance by doing a hard lazily stop & sporadically seeing if the car miraculously moves left or right, but I find it impossaible to notice, is their a trick to it? The suitably testing station used rollers.