From memory 4 zones. It was fine with real solder.
I think the problem is inadequate pre heat. So the guys are pushing the temperature too high at the soldering stage. Unfortunately even that isn't enough to compensate for the poor pre heat.
I just had to put my money on the table and replace it.
The next step is to upgrade the pick and place. Even with second user kit that will be real money. The pick and places are again TWS Automation but we need better. 0603 is a struggle so I don't go below
0805 but more importantly more and more ICs are too fine pitch and now with Altera BGAs on the horizon...It's either keep the kit reasonably up to date or pull out of the game as far as I am concerned.