Canon Pro-100 Firmware 2.041

[Stormlight]

For the CLI-8 it should take about 13ml of ink or if allowed to be overfilled would stop dripping with 14.4g of ink added to the cartridge.

https://www.printerknowledge.com/threads/cli-8-and-cli-521-526-swap.7705/page-8

Not sure if the Canon megatank inks can be used to check and rule out your current inkset from being the culprit.

Hopefully its not a printer issue and it could be resolved.

I always overfill because ink is cheap . Usually, I let it overfill and put in storage. With everything sealed and vent taped off. I only let it drip out prior to install into the printer and open the tape on vent. Yes, my sponge is stored with excess. I figure this is a good thing to further saturate the sponge. This means I always have at least 2 set of cartridges.