Neem works wonders for me with leaf miners...
I'm by no means a citrus expert, but I used to have major problems with leaf miners, across many species (lemons, limes, mandarins, calamondins, unknown seedlings etc.), and have ZERO problems with them other other pests now.
Now when there's a growth flush popping up, I simply got into the habit of spraying (at night only) the emerging new growth with diluted neem. And do this say every 3 or so nights until the new growth gets fairly mature over a couple weeks. Since adopting this practice (a couple years ago) I have Never have any issues with leaf miners or those little turd looking caterpillars, or scale/soot .....Not even once.
I realize some are not as fond of neem, so I'm only saying what has worked for me. Also I guess it's worth noting that most of my trees are small/medium and potted (so this spray regiment isn't that tedious for me), but I have a couple larger in ground meyers and do this for them too.