I think you’ve found that you no longer need to train max strength with ice tools. And your max fingerboard routine makes sense to me.
Another one I’ve been trying (with the intent of mimicking a gym-based “big lift” protocol) is multiple series of 4x 3″ with 1″ rest and 2′ recoveries between series. So with a stopwatch running, I look at the display and think (on the second), “Start, 1, 2, stop, start, 1, 2, stop, start, 1, 2, stop, start, 1, 2, stop.” Then rest two minutes.
By doing that, I’ve found that I can get more time under tension than repeats of 10″ hangs at the same weight.