Equal current sharing is good, but I am not too worried about being exactly precise at every stage. I have a few suggestions, some of which may prove helpful. For common frame of reference, this is a triangle shaped 13S pack, and all P-strings are connected in the normal fashion except ...between P-string #8 and #9, we are using blue wires to make "jumpers". The shorter jumpers have lower resistance, and the longer jumpers have higher resistance.
Instead of having a series connector from each cell to one other cell on the neighboring P-string (making 8 of them)...Make a series connection onto the parallel bus between two cells in the P-string, which cuts the number of series connections in half while still providing an equal amount of resistance for each cell. Now, you'd only have four series connections between the problematic P-strings to co-ordinate, instead of eight.
I can only assume you don't want to overlap the series connections because you are using circular-cross-section wire as the jumpers, and the point where they overlap will cause a lump. I can imagine making the shorter jumpers longer, and just coil up the excess length? another method might be to construct cross-overs from two flat strips of copper sheetmetal, with heat-shrink insulation over them.
In the pic below, the builder was not using enough series connections. The pack shown is 4P, with one nickel strip connecting the P-strings (red arrow). This lead to the single nickel series connection getting hot, the pack providing fewer amps than the cells were capable of (voltage sag), and un-even current sharing (cells near the single series connection provided more current than the cells farther away).
In this pic, I was also suggesting that the series connections should be copper.