Slow-start lead-acid charge - good or bad?
I don't see a problem with trickle charging lead-acids. If you get a 400-600Ah pack, you won't get up to the recommended 10% CC mode anyway since your panels deliver 25A max.
As far as I understand, trickle charging should be more efficient as well since there is less heat being dissipated, if I'm not missing anything.
So your setup looks ok to me, although you won't be getting the maximum amount of power that you can store from the panels.