[CapnScurvy]

Hello TaipaN

2560x1600 resolution....... Wow, that's big. There was another gamer named "Trebby" that has the same resolution and aspect ratio. He asked if one of the Aspect Ratios fixes I have with the Optical Targeting Correction (found HERE) would help him. It's my belief that the 8:5 mod would work for your resolution (16:10 aspect ratio would seem to be the same ratio as an 8:5).

But, there are a few underlying problems for you and the mods you're using.

First, I don't have a compatible OTC mod for TMO 2.2 (or any other version 2.0 or 2.1), and it's compatible RSRDC v502 mod. I'm working on a TMO 2.2 compatible OTC mod right now but it's not ready to be released. A compatible OTC for RSRDC v502 will come later. My SCAF for TMO 2.0 will not work with TMO 2.1 or 2.2 (too many changes to the TMO updates to think you won't have problems with a SCAF for TMO 2.0 compatible mod with the updates). So the bottom line is, there is nothing you can do for now, to improve your game.

To get specific with your questions:

A ship only 2000yards away can have major errors in stadimeter range compared to radar range or map contact. I assume it's because of my resolution and aspect ratio.

Not necessarily, believe me resolution does play a part, but so does inaccurate mast heights listed for the particular target you are trying to get a Stadimeter reading on. TMO and RSRDC have a few mast heights that are so far off that at a 1000 yard distance, the stadimeter will produce an error of 500 yards difference!! RSRDC introduces about 50 new ships to the TMO bunch that adds about another 10 over stock, I'm guessing the mast height errors are probably the main culprit. You could have the resolution set just right for the system you use, but if the mast heights aren't reasonably accurate you won't get an accurate reading with the Stadimeter.

Will SCAF for TMO2_RSRD version improve my stadimeter in TMO2.2 with RSRD at all for any reason?

I wouldn't try it with TMO 2.1 or 2.2 unless you like being sent back to the desktop. Sorry, but SCAF is only compatible with TMO 2.0.

Does SCAF correct the issues that happen at from screen resolution or does it just correct the centered accuracy?

It does nothing for the resolution. That's why I consider OTC as the "next generation" fix for manual targeting. It not only fixes the various resolutions a gamer uses for optical views but corrects the accuracy of the height and lengths for the ships in the game. It also corrects the Stadimeter center point for calculating range to the independent periscope view that it uses for marking range. I found the position was off by several meters resulting in an additional error of up to 25 yards in 1000 yards distance depending whether you had the same target at the front of the sub or to the rear.

Alternatively is there a file I can edit or mod to help my resolution with the stadimeter?

The Camera.dat file holds the key to correctly setting the resolution you use for accurate periscope and TBT/UZO views. The parameters need to be "scaled" to the particular periscope/TBT view size you are using at these stations. But as I've pointed out, there are other factors (like mast height) that have a lot to do with getting a stadimeter found range to be accurate. OTC takes the correction a step further by finally having the periscope and TBT telemeter divisions (the lens hash marks) accurately measure a targets height or length. This will give another type of "found measurement" that could be used for determining range or AoB, along with the stadimeter, radar, or sonar equipment. It's what the real life Captains used, but due to the issues of inaccurate game resolution rendering, stadimeter off centering, incorrect mast height measurements, incorrect Field of View size, you can not rely on manual targeting giving you a reasonable range figure based on either the stadimeter, or reading the telemeter divisions of the scopes. Unless you use OTC.