The scope not being mounted perfectly straight is not going to be a significant factor.I have mounted scopes on many rifles and even those that required a great deal of windage adjustment did not cause any such problems.If you have access to another rifle,you can test to see if the results are the same,since if one of you has a big flinch,it will usually be present with most guns.I had the big flincher that I mentioned in the previous post shoot my .223 and the results were exactly the same for the first few shots but faded somewhat when he realized that there was no significant recoil.He spent a great deal of time shooting a 22 and this seemed to help although he still has a slight flinch.I have seen othe people flinch though not as bad but all were right handed shooters and in every case the point of impact was to the right andoften high.