6 years of doing my strut mod and up to now no issues so I hope I have enough knowledge on the subject lol. For 1 inch you will be fine and ive machined a lot of them no issues at all. If you have high mileage I wouldn't do it but you said you have new shocks so your ready to roll also its only .62 inches of shock stroke lost not much at all.
I have 2.75 on mine (spinldes/modified struts) on my escalade and I barley aligned where as another truck I did aligned fine. Also daily driven in pothole full san francisco no issues and is safe. The oem shock or autoride shock shaft body thickness is exactly the same in the oem position as well as if you mill the rings lower does not thin out (already cut a few bad shocks in half to verify) Im going to actually go over my alignment tomm to check it out since I took lower a arms off to take some measurements for custom spohn front lower a arms and put it back together. Lined it all up with marker lines but I just want to double check to be safe since I messed with upper camber was able to push it out a little more. If you can wait till tomorrow Ill be doing my alignment on mine and I'll throw up what came up just to give more feedback here.
NOTE MAKE SURE THE MACHINE SHOP RUNS THE SHOCK BEFORE CUTTING IT. Lots of shops dont check this and when they mill it one side is a lot deeper than the other you do not want this also on autoride struts DO NOT let the shaft move because it will break the shock even when you tighten it up. shoot me a email I made a custom tool to help you take apart the shock and not damage it
[email protected]
If the shop has any questions on milling it they can call me also I've helped a few of them because they look at in and just never have done it so not sure whats up
One last thing if there was ANY issue with the strut mod that I would have seen I would never have put it on my wifes truck that has 2 of my little kids in it everyday. Its a mom mobile/drag racer/road course events at good guys show. I think this last paragraph pretty much sums it up.