Compared to some other hearings, the reps asking questions seem legitimately interested in making the bill suck a lot less. Time will tell, I suppose, and it sucks that this bill made it this far, but I'd highly recommend watching the feed if you care about the outcome.
For example, your next letter to your elected representative could reference specific content of the discussion rather than rehashing something that was talked about. Nothing says "I care" like "I cared enough to sit through the same hearing you did."
That seems like a large part of the problem; they treat it as a foregone conclusion that the bill will pass, perhaps with a bit of tweaking. This bill needs to die. All bills should have the presumption of failure, with a very high bar to get them to pass, not the other way around.