Just look at the target. Bring the sights to what you are seeing. Exception, if in an odd position, can not see a target, unsure about drawing from that angle.....that type of thing.
I have tried it with and without a fiber. Found it was much faster with the green fiber. Just easier to track the sight. On my 2nd shot on a target, seeing the fiber drop back into the notch is much easier with a fiber.
I am really trying to shoot sooner. Sooner is faster. When it comes time to move.....move as fast as I can.....may not be that fast, but it sure feels like it.
Glad you solved your problems. Later in the game you may want to tune your mags. https://dawsonprecision.com/dawson-precision-sti-2011-hicap-magazine-tuning-kit/