Hi Kevin, you've got a nice scene going on there. I've had some further thoughts on your ice shader which may help add a little more realism to the water ice. It goes along the lines of having a vanilla water layer, ie just the water shader with no distortion, then have a second water layer 10cm lower, that has your displacements on it which protrude 20cm. At the base level of your lower water level, use a default shader to make the base altitude transparent. The idea, is that your ice lives just below the water level, rather than morping into the top water layer, as it is now.
Send me a tgc of your water via PM, and I'll show you what I mean.