question

@Tim Rohrer, a couple of things: I'm hoping that your statement of "...and that +450A or so is being applied..." is a typo? 450A into a 600Ah LFP bank is far higher than most manufacturers recommend (standard recommended LFP charge rate is .5C or less) and is obviously far higher than the MPPT is capable of putting out, so I'm hoping that it's a typo.

What is the charging voltage set to in your MPPT, and how far is the MPPT away from the battery bank? If the MPPT is far away from the battery bank, it could be reading 13.7v as a result of voltage drop over a great distance or through undersized cabling - or as the result of a poor connection somewhere along the line between the batts and the controller. A poor crimp somewhere along the line could easily be heating up and increasing resistance on the line, which would cause a voltage drop.

I would start by measuring the battery voltage at the terminal screws of the MPPT, then measure the battery voltage at the battery; if there is a significant difference between the two, you know it's an issue of voltage drop or a bad connection somewhere along the line. Then compare your readings to what the BMV is telling you the battery voltage is; the BMV reading should be nearly identical (+/- maybe a tenth or so of a volt depending on your multimeter) as the voltage reading at your battery. If it isn't, then you know that there's an issue with the BMV. There are a number of possible causes for this, so I'd start with getting those measurements and reporting back; those measurements will help us further diagnose the system.

EDIT: I'll add, in case I misread the original post, that if you have loads running while the controller is charging, the controller will -depending on the loads- stay in bulk mode because it's effectively powering those loads. Technically it's capable of putting out up to 100A of charge, but even if you're only running ~10+A of loads, the controller won't generally switch to absorption until the loads go away; you're effectively powering your loads straight off the solar controller. Obviously this depends somewhat on how you have everything connected; if you wouldn't mind posting a photo of the wiring/battery/shunt portion of your setup, that would also be helpful in diagnosing what -if any- misbehavior of your components might be occurring.

It seems your BMVis resetting too early. The Victron mppt manual explains you have to change it for solar. Otherwise one cloud can see the current drop and the bmv thinks the system is in float. A high current shore charger won't cause it to reset, but a low power solar will. The default setting I think is 13.2 volts and 4% end amps.

Increase the voltage to slightly less than that absorption level say by 0.3 volts.

My LifePo4 settings are in the screen shot.