Personally, I have absolutely no use for lightweight springs in a Glock pistol. You can run into primer ignition problems with certain ammo; and, you might even find that the trigger is actually too light for safe use at the range. Me? I wouldn't be drawing that pistol from a holster, either.
(I've, also, heard of several modified Glocks that have no discernible trigger, 'break point' - Squeeze the trigger and they, just, go off!)
I use an LWD 3.5# connector in combination with a rigidly-fixed LWD trigger stop. I went in exactly the opposite direction from what you've got there by using Wolff, '+ power' trigger return and firing pin springs in my own pistol. My action has been smoothed out by a COMPLETE polishing job that has left me with one of the cleanest breaking Glocks I know of. I've got a readily discernible trigger break that lets go at a crisp 4.9#'s - Plenty safe for carry.
I carry this Glock, everyday, and frequently do very fast double and triple taps from reset with it at the range. This reset is the best I've tried on anyone else's Glock, so far; but, in fairness, I haven't tried a Vanek trigger, yet. (Not even sure if I want to - What for?)
No self-respecting Glockaholic ever talks about it; but, a Glock's trigger mechanism CAN BE, 'stacked'. (tapped until it finally goes off!) I suspect that light springs would increase this tendency. I don't believe in using lighter springs; and I, also, won't use any connector lighter than 3.5#'s.
You should be aware that certain springs and a very light connectors are a recipe for ND's in a Glock. 26 newtons is about as heavy as you want to go on TR and FP springs. A 3.5# connector is, absolutely, the lightest I would ever go, too. Whenever you make modifications of this nature on a Glock, you need to keep it empty until you get to the range and run, at least, 100 rounds of ammo through it in order to see what it's going to do.
There are several different generations of Glock pistols and numerous different models with nonidentical internal and parts dimensions. If you don't carefully check how your modifications work, then, sometimes, you can get a really mean surprise when you least expect it - It's happened to me; and, I know of others who've had similar unexpected results.
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