Borax dissolves rapidly enough so that what you add would not get 'stuck' on the filter for long. I'm not sure how much you are adding, but a "small amount" may be simply too small to affect things.
Unless you add CYA directly, you don't need to test for the effect of using trichlor more than once every 2 - 3 weeks. You probably should go ahead and test for calcium and total alkalinity, however.
I wish the CC was lower, but since it's not, using trichlor as you are is probably a good way to chlorinate, as it will tend reduce your CC's.
You probably should try to swim, although I'd be cautious since we really don't know how irritating the remaining CCs are. So limit your swim sessions to brief, but increasing, periods till you are confident that the water is not irritating.
-- I see Yeggim & I have been simul-posting --
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