Try moving mast position and see what happens

Thin high aspect wings get massively effected by seaweed or indeed even just debris in the water. Even going through a pocket of water that has sand mixed into it. The wing seems to stall really easily in these conditions. It is literally zero fun to foil in conditions like this. The thicker low aspect surf wings seem to handle it better.I don't think choppy conditions matter very much for early lift, but pumping is much easier in glassy conditions. I think that's more because of needing to react to chop disturbances and the ability to ride higher on the mast in smooth water.