Module testing methodology

I stumbled upon a possible module testing method today that I haven't seen discussed. I am working on a Gen1 battery pack which I swore I would not do anymore due to the age, electrolyte leak etc. However a friend convinced me to help him keep it going for 'a little while longer'. The car does only have 108k miles so I thought I'd help him out.

We started with an intermittent P3018 code (cell block 8 becomes weak). It would go away on it's own, then come back some days later. First test was with Techstream. When placing battery under load voltage drops looked perfectly normal across all cell blocks with no voltage deviation greater than .15. However, when forced charging it was clear cell block 8 had an issue, always charging the fastest and going about .25 volts higher than the next highest block, only to drop back into the lower range of the other blocks under load.

After taking the pack out of the car I started with a basic voltage test. All tested between 7.81 and 7.87 volts. Then I put each module under a 100 amp load for 8 seconds. They all held strong including both modules from cell block 8 at about 6.5 volts.

Now for the new method based on the Techstream results from the force charge. This is very time consuming but I felt worthwhile in getting this pack right. I put each module individually on an RC charger and recorded beginning voltage and placed under a 1 amp charge. The voltage will fluctuate as the amperage is applied so for example the typical module would start at 7.82 volts and when the charge reached 1 amp within 10 seconds or so it would go up to 8.02, then cycle to no charge for a few seconds, then up to 1 amp etc. The 'good' modules seemed to fluctuate .20 volts difference between no charge and 1 amp charge. When I hit the first module in cell block 8, it started at 7.83 and within 10 seconds was reading 8.45 with a 1 amp charge. I know rc chargers aren't the most accurate so I tried another one with the same results.

I found 3 modules with fluctuations greater than .30 which I removed. Now the reconditioning begins with the first cycle on a grid charger, followed by a discharge then a few more cycles.

Would also like to clean off old sealant and reapply. What would be a suitable sealant for this?