Excellent news, I have regathered my forces and attacked the chara once more. After getting the Kasco back from repairs, (and pulling the power cord in along with a couple hundred pounds of chara) I re-deployed it this time facing the middle of the pond instead of the edge. After a day of messing with it to stop the chara from clogging it, it began to run clear. a few days later and it is holding open about 1/6 of the pond on its own. 20 yards in front of it is completely clear of chara and it is knocking down chara all around it as the current makes a circle about 60 feet wide. It has cleared the water down to the bottom directly in front of it (6ft) without being pointed down (which I now am thinking of trying). This has also knocked the duckweed down to a very manageable degree.

So, to learn from my mistakes, point it towards the center of the pond (ish) and be very mindful of clearing stuck vegetation, especially when moving it.

0.7 acre pond stocked 2020, LMB, PS, YP.