Man, don’t give up again. You’ve learned a lot and have some nice lights. This isn’t a safety issue.
I think - possibly - it may be glitching because you’re switching modes so quickly…? If you go slower, allowing just a bit before going to the next mode, is the glitch repeatable that way?
My thinking there is based on my own experience with half-pressing reverse clicky switches like this. These aren’t too different from any other type of switch that connects or disconnects the flow of electricity to a circuit. Where your wall switches at home are usually just a solid on or off, these switches will break the circuit when pressed halfway or so, before the click happens. If we do this quickly then the programming in the driver says hey, do something with that fast signal you just received. It can get a little complex because we ask these little chips to notice very small levels of timing, and we ask them to remember settings (modes), etc, etc. But all you’re doing is breaking the circuit for a moment and the driver does its thing.
If there is actually a firmware glitch here…well, what to do with that. Just be annoyed, but don’t be worried about safety. It’s possible that’s the case but it could just be how you’re operating it. AND…just a shot in the dark but it crossed my mind that perhaps something could be a little different when fast-clicking like this because this is a high boost driver, taking you from single cell voltage up to 12v. That could change things to where repeated cuts in the flow of electricity might momentarily cause the inductor to not give the steady boost it’s supposed to. Maybe? I can’t back that up with any technical support, though.
But I’d try to slow it down and see if it persists. Rule that out, anyway.
Also, if you didn’t already, you might take the switch out and give it a close inspection or a shot of canned air just in case some of your metal filings got in there somehow and are interfering with the path of electricity (doubtful, but it’s possible). That’s a pretty cool mod, by the way, the gob of glow looks great.
But relax…no safety issue here and the driver isn’t trying to protect anything, no worries. If there’s a legit glitch in the firmware or if it just can’t handle that kind of fast-clicking and that’s how you prefer to work a light, then it’s not your model of choice…next model, please! 
(one other note on timing and firmware……you may read on various threads about how timing is implemented in different ways/different reasons for some firmwares. That gets into the nitty gritty of actual electrical engineering and programming, but there’s no need to know all of that unless you want to. With some firmwares a normal quick-ish half-press will advance the mode forward as usual, and then a longer half-press will move backwards to a previous mode or down to moonlight mode. Pretty nifty.)
