One thing Ive found with aiming these guns, those with just the front sight anyway, is youre better off just using the front sight as a horizontal, left/right reference, and not actually trying to use it as an aiming point. I normally sight/look along the top of the flat of the frame, and I usually get much better results with hits going where I was looking by doing that.
My pug has the XS "big dots" on them, and I really dont find them to be all that great either.
Realistically, if youre used to point shooting, at the distances these guns are likely to be used, just pointing the gun is going to be your best bet. You just need to do so beforehand at the range, so you can get those indexes set in your brain, so its got the reference.