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Cutoff temperature: it reads the little probe that comes with the SB989. The probe can't reach most of the cells, so you're running blind. How about 40°C to play it very safe? Temperature won't damage a cell (much, I think) until it approaches 100°C, but you can't measure every cell.
Trickle is how many mA you want after charge termination. Since the first thing you're going to do is fully charge each stick, then give it a long, slow 0.3A trickle charge, the "trickle" feature doesn't really apply here.
You may have noticed your sticks are longer than the red and black leads they supplied, and that their little gator clips are designed with smaller batteries in mind. The red and black leads are on screw terminals for a reason.
Charge and discharge until you reach the cutoff conditions. 0.9V on the way down, 0.05V less than the highest voltage observed on the way up.
You can go with a full 10A of charge, if you can keep your sticks cool. Running the pack's 12V, 120mm fan isn't the worst idea in the world.
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