Well spiralling temps finally forced me to overhaul my system a process that goes like this.
Drain loop, much stainage and cussing.
Disconnect pipes remove graphics card.
Remove CPU water block
Remove water block from cards take apart and clean out reassemble.
Dismantle CPU block remove gunk causing severe blockage clean in acidic solution scrub clean then rinse in distilled water reassemble.
Blow out rads, flush rads with acidic solution, thoroughly rinse out rads, rinse some more with distilled water
Still have to do-
Install new piping, remount blocks with thermal compound remount rads fill with distilled water hook up to power supply pump only and leak test for a day
Arb,s thoughts, next time go air cooled!!!