Waterfall, have you stopped using insulin altogether, or just the fast acting stuff? Whilst I'm not T1, those numbers could be suggesting you may need a bit of help keeping them down, but that is something to discuss with your team.
Is the GERD a new thing? I see you are eating LC, so am curious, as many find their GERD improves with LC.
If you lost a bunch. Of weight leading up to your diagnosis it may take a little while for that to come back again.
Again, not T1, but as someone who eats a low carb diet, when I have needed to gain a few pounds, I have had to work at it. I upped portion sizes firsthm then a bit more protein and eventually added some fats into the mix.