Well, no experience with the straight eights but, I did try the XS Big Dots ( same difference). I did not like them, I would either shoot high or low. The sights were fine, I just could not get the hang of them after being used to the 3 dots.
If you state that your friends also shot high with it, then it inclines me to believe the front sight is too short. Unless, you have the ability to adjust your rear sight (which I don't think that is possible with the straight 8's) down.
A couple of inches at 7yds will turn into ft. at 25yds, that is a given.
Ok, this might sound cheesey but give it a try. Buy a small plastic or wood dowel approximately the size of your front dot. Tape a piece to the top of your front sight and shoot it using the new dowel as your front dot. If your groups move down closer to the POA then, there is your issue (short front sight).
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