Yes, I have the Turnigy 1080w. You're probably familiar with the over-current-protection issue I have with it. I have solved that by simply clamping on my cps1620 for a few minutes. So, yes, a bit of a pita, but no real biggy. I have yet to try it on very-near-full batts. The starting amperage may or may not still spike over its ~60a set point, at power on. If it does, on goes the little gophert for a few minutes.
Lately I've had my 430Ah bank split, so I've been using all 3 chargers to see how each performs. The modified pm4b-45 can be dialed up to 16v, as well as both the turnigy and gophert. So I'm covered either way. But the issue is still keeping up the amps while charge acceptance declines.
Remember, top charging borders on "over charging", as you're trying to force amps into a batt that says its quite near full... kinda like trying to put away that last hotdog in an eating contest.
EQ'ing IS overcharging, and the same issue exists... trying to force feed current into a greatly diminished load... kinda like that Monty Python skit where the waiter offers that really big guy a 'wafer thin mint', after he's already eaten way more than needed. But the gophert, being variable-adjustable, (meaning amps and volts can be adjusted) allows for the amps to decline as usual, but then when they start coming back up as the battery starts to overheat slightly, the amps are limited to my 5% setting, thus preventing thermal run away... at least that's my understanding of what's going on.
So, to answer your question, I do a half-azz top charging like everyone else. The best one can do with a constant voltage charger is bring the batts to a very low amp reading at 15-16 volts. I generally bring mine to about 2.5 amps per 2-6v's, at 14.8v. And if an EQ is in order, I will take them to about 2a at 15v before EQ'ing.
And 'til now, I have always done roughly 80-97's, while boondocking, so a lot of top charging was not needed, but if I switch to say 70-90's next season, I will have to stay up on the top charging, weekly or bi-weekly. I will let the SG readings determine that. Of course, going solar next year will change everything, as well.