I dont like to discharge Nimh packs. Most manufacturers dont recommend it either. They also dont recommend trickle charging.
I get the best performance from my IB4200s by charging at 4 amps, stop running as soon as it slows down, and charge at .2 amps for 24 hours once every 4 cycles. The slow charge allows the cells to balance at the peak, instead of at full discharge. Some like to balance at full discharge, but I think if they are balanced at full charge they perform better. Think about it this way, the cells may not be exactly 4200mah each. If one is 4250mah, and another is 4150, then when you balance them at full discharge, then charge them at 3 or 4 amps, the one cell that is 4150 will reach max charge sooner, then while the other is still charging that cell will get a slight overcharge. It may be a small amount, but over time that cell will lose more and more capacity from slight overcharging, then it gets worse and worse. On the other hand, if you balance them with a slow charge for 24 hours, they all get a full charge without the possibility of overcharge. At such a slow rate they can bleed off any extra charge as heat.
These cells are really ok with whatever, except overcharging and over-discharging. They dont have memory like Nicd, so unless you prefer to balance them by discharge, then there is no need to do it.