if you are just trying to shoot with both eyes open it takes a while to get accustomed to it.what i done was were a ball cap and take a adverstizing card for instance and apply to the bill of the cap with a paper clip then bend it down to cover your line of vision to the target.it s like you can still see everything but it helps to teach you to look with both open but puts more empathis on your eye and line of vision through the peep.try it for awhile and periodically shot with out it.practice will help you alot to overcome the blur out of the other eye at least it did me. i hope this can help you a little
as far as sight pin i think the 029 would be the better size unless your vision is impaired.i use 029 and 019 on my set up with the smaller pin for longer yardage out to 30.did you feel comfortable with the pin size before? what does your gut tell you considering what size you shot before.