Canon Pro-100 Nozzle Check stutter pattern

[SV_Trinity]

I'm hoping the experts here can help me figure out the stuttered pattern on the CYAN channel.
What might be the cause ? What are my next diagnostic steps ?
Thanks to those whose posts I've read thus far ...

HISTORY:
Precision Colors in OEM Canon modified cartridges.
Have tried cleaning printhead (windex, distillled water) with resultant perfect Nozzle Check, but shortly afterwards, this CYAN pattern returns.
Have tried two sets of OEM modified cartridges.
Have dripped windex to Waste pad and confirmed ink is pumped away.
Have confirmed CYAN ink is flowing (drip drip drip) when silicone plug removed from drilled hole of modified cartridge.

NEXT:
Have ordered an new Canon OEM CYAN cartridge to rule out bad sponge in modified cartridge(s).

 

[The Hat]

Have ordered an new Canon OEM CYAN cartridge to rule out bad sponge in modified cartridge(s).

The new OEM cyan cart will be your last resort, if you run 5 or 6 test prints and the nozzle check doesn’t improve then only a new print head will solve your problem..

The print heads in these printers are not designed to last for ever…