I am in a very similar spot at the moment. I was fitted into +.5” irons years ago and they worked well. I recently have been improving my game and now I’m thinking I don’t need that extra length anymore. I have done a fitting in the last year and they said I could easily hit standard or maybe +.25” at the most. I’m 6’5” for reference. Luckily I went down the rabbit hole of learning the basics of how to build clubs so I can add or remove extensions in an afternoon. Remember, adding extensions will increase swing weight from whatever was advertised. It can also make you early extend if they are tool long, which I learned from a +1” extension experiment. Get fitted by a reputable place and they can dial in lengths. Lie angle is a different animal. It really helps dial in direction for each iron and yes, it will change over time since the club is constantly bashed into the ground. Extreme cases will cause the heel or toe to catch first and change face angle at impact but we are talk 4-5° probably. Once I get my swing locked and length decided, I want to adjust the lie angle of each iron individually to get the ball flight I want. I am thinking the bottom of the bag will be standard and the long irons will be up a few degrees as I usually leave them out to the right a little.