Have you ever tried using a wipe applicator for the close in stuff instead of the backpack ??
We have used that with the glyphosate in the tomato crop for the last few years. You do have to be careful, but we killed very few tomatoes last year as long as the dew was off the plants before we started.
The other option is Paraquat / Diquat. It's a "touch kill" but doesn't translocate to the roots.
If you want some info on wipe applicators I can show you how to make your own for cheap out of PVC.
Carol
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