I hope you aren't concerned about these 3s. I also get loads of them, and I consider it to be a good thing; provided I (and you) feel fine. Scores in the 3s are only really a concern for T2s, when on glucose lowering medication, such as Gliclazide or insulin (Metformin isn't in that group, whether or not you're taking it), or if you feel unwell when it happens.
In my view, many non-diabetics have periods when their bloods naturally run in the 3s, but they simply never know, because they don't test. Down into the 2s, it's getting a bit too low, and when I've been there, I usually feel very hungry, but to be honest, it rarely happens unless I'm pre-meal or I haven't eaten a massive amount.
Good work and good luck with the ND.