I would just say that the dose you are at now, for most people would hardly be active, I really dont know how much of a difference, or how accurate you can be (even with liquid) as far as 3.5% of 1.4mg. How long you at 2mg or lower for? I would imagine it would have had to be quite a while doing 3.5% every 2 weeks, if my math is any good you would have been there for like 10 months or something already? I would recommend instead of following a schedule with the taper listen to your body, get used to one dose first, trust me you can get used to this dose as long as you have stable blood drugs levels throughout the day, its the same as getting used to complete sobriety it just takes time, one step before the other you know.
Learn how to fight/work with the anxiety as that is something you probably have forgot how to do normally, you got to rebuild your brain, your whole life if you will its not just about the dose of medication. If you have to go up to 1.6 mg or something I think that wouldn't be the worst thing in the world. To be honest I think you are causing yourself a lot of extra worry, which translates into withdrawal, when you force yourself to do these drops every 2 weeks if you feel you aren't ready to go lower, even though the drop is tiny. I personally cant imagine a drop of less than .25mg to have much of an effect so i would assume you just arent used to your new lower dose yet and just need to wait it out learn to be okay at this dose, I think if you do that when you finally decided to drop this last 1.5-2mg it will be so much easier than anything from the rest of your taper. 2mg of valium is very little unless for some reason you metabolize it extra slowly or something, not an amount that someone would likely get addicted to taken daily. So keep on taking that daily, you are a lot closer to being clean than you think if you ask me, if you get used to this dose, that is like right beside sobriety
I actually had the same thought regarding opiates as far as your comment "don’t think there is any amount of time that would actually stabilize me. It’s pretty much grin and bare it until the finish line now I think. It’s awful but it’s manageable for the most part.". I did a methadone taper years back which failed, I thought I could never get used to the low dose and it caused me to try and speed through the last bit to try and "end the misery" unfortunately it didnt really work that way, the way I see it youve got your set amount of misery you have to experience and you can either stretch it out or take it all now, which doesn't help much as far as the mental side of addiction. Do you notice that you get peak effects at a certain time of the day? If so I would say split your dose maybe, at the very least make sure you get the peak effects when you need to sleep if you have trouble doing that. You are almost there, I feel like its pretty fair to say you've got months, not years left so definately don't stop