Probably your fliers are the result of just not being completely familiar with your sights. However, without actually seeing you shoot, it could be one or several of many things.
You'd ideally want to keep your pattern tighter than that, or at least without the fliers. That takes a lot of trigger time.
You might want to consider a laser training system. It'll save you time and money. The link below is a list of the better laser trainers available.
https://www.cchit.org/laser-firearm-training-system/
I'm familiar with the Mantix system. That or the GSight are the ones I'd recommend, but others may be familiar with others they like. i like these systems because they allow you to actually use the same gun you'll be using, not some replica with a different trigger, sights, etc. Also these two allow you to practice at home in your den or whatever, so no need to schedule range time, drive time, whatever. And considering the current cost of ammo, it'll pay for itself after just 300 trigger pulls or so.
And they definitely work. My buddy bought the Mantix system and went from a B-/C+ shooter to a consistent A-/A shooter (acuracy-wise) in just a 6-8 weeks, training just 4 times/week about 20 minutes a day. And his speed from shot to shot decreased by almost half in the same time. So these things not only help improve your accuracy but your target acquisition as well.