I went through the same decision making between the RS1x and IN83. In the 30 plus years I have worked in the A/V business I have learned that specs can be a guideline but thats about it. I took home three projectors. The RS1x, Epson 1080 and IN83. I was coming off a SP7210. I had read a lot of good things about all three. I have a 106'' High Contrast Cinema Vision Grey screen. Please keep in mind that atleast for myself I was and had been use to a DLP projector with the 7210. All three nice in their own way. However the IN83 won hands down to my eyes and on my current screen. The JVC was a clear runner up. The JVC just didnt have the sharpness, colors and 3D pop I personally like. The black and shadow details on darker seens may have been a little better on the JVC, but the IN83 black levels and shadow detail were not only fine, they were very good as well and the other things as mentioned above like color, sharpness, brightness when needed and just the dynamics of the picture looked the best on the IN83. (To me and my eyes.) People like different things or we would all own Bose Speakers and the same TV or Projector. (Bose-Oh my god!) Thanks goodness we dont all see and hear and like the same things.
Anyway the IN83 won it for me. However there is the installation issue mostly because of offset of the IN83. I could only mount it at the 8' level and I didnt want to use keystone adjustments nor have to sit the bottom of my screen on the floor. I have a fixed screen, so to compensate for the offset and 8' mounting, I tilted the top of my screen out 1.5 inches and no one can notice, I have zero keystone issues and the picture looks uniform and fantastic. I can leave my iris fully at 100 for a bright plasma like picture or tone it down. I usually leave the Iris set at 45-55 depending on whats being watched.The settings out of the box on the IN83 were pretty dead on. BluRay on the IN83 is hard to beat as well. Very 3D and great colors.
Also the scaling and picture on non HD material looked better compared to the JVC and Epson. I havent mentioned the Epson much because it did nothing for me. Each projector was left in place for about a day so I could watch many different sources on each. Good luck and with either projector you will probably be happy but if you are use to DLP technology you will, like me, probably favor the IN83. Oh---Like you mentioned, I use to be one of those people that spent more time tweeking and picking a picture apart until I realized that its much more enjoyable to enjoy whats being watched. I use to sit and look for flaws so hard I never enjoyed the content of what was on. Much nicer to be able to sit back and just enjoy a beautiful picture watching a movie or TV show with great sound. Enjoy whatever you buy!