To be clear, the project spawned from me also running out of Vint browns haha. I chose to steer away from explicitly mentioning this in the summary because of the stigma that we all know about at this point.
Once I have switches in hand I'll be testing lengths and weights for the springs side by side to determine what I personally like the most, and in addition the one that feels closest to my stock vintage browns.
Aiming for those 2 goals simply because my preferred setup is vint browns spring swapped with Sprit or TX 62g, but I know that a lot of vint brown users prefer to lube the spring to reduce ping and nothing else.
I just noticed that you said this will be the new 16mm spring from TX. I will advise you to note that those springs feel at least one weighting heavier than the 14mm (normal) springs. I've been testing 3 different weights (75g, 70g, and 67g). The 16mm/67g feel slightly heavier than the 14mm/70g springs at the top. That's the nature of these longer springs. You get more of the full force of the spring up front. What I'm saying is, if you like traditonal 62g linear springs (say somethign close to a gateron yellow), these 16mm springs will feel noticably heavier at the top. I like them... just warning.
16mm is currently tentative. Once samples are in hand, I'll be trying 16mm and 14mm of both 55g and 62g and see how they both feel. I was worried that 16mm might cause too much of a weight shift anyway, which is why I'm wanting to feel it out more. Especially considering the goal is a more ergonomic switch.
The 16mm springs by TX look and feel similar enough to the sprit slow springs that its safe to assume (for me at least) that the actuation weight is increased by 5~ from the standard cherry springs that go by the formula: actuation weight +15 = bottom out weight.
With that said, 55g 16mm feels really similar to cherry brown spring which has a bottom out of 60g. If you are trying to stay around the cherry spring feel, I would wager either 55g or 57g 16mm, OR 62g 14mm are our candidates.
I have been a cherry brown believer for 8 years now and am running out of vints so I hope this project goes smoothly and tries to replicate the vint brown tactility. Modern browns have about 75% of a vintage browns tactility for those wondering(in my opinion).
I've heard the same from quite a few people regarding the 55g, so I have high hopes for it as a second option.
I'm not sure what it may have been in the past, but 62g has always
felt softer and lighter for me after swapping them in, but I'm hearing a lot of people say the opposite haha. Same for the tactility it seems. All of the vint browns I've used and owned have had a smoother and more rounded tactility than newer browns, even pre-lube.