There is practically no flow at 11w on speed 2, which really just confirms more or less what you already know, 28W on speed 2 = 15 LPM but as its only on start up its hard to draw any conclusions from that.
From the above it would certainly appear that there is a very severe blockage(s) somewhere.
From the above it would certainly appear that there is a very severe blockage(s) somewhere.