Biba I am in the same boat as you. I have 27” monitor and play at a resolution of 2560X1440. I also have been playing with trying to balance between what I feel is a natural position vs playability w/ the tiny /masked HUD. I found in a thread about exporting the HUD a method to change how the HUD is displayed. I have not been able to dig too much yet, and I am fairly new to DCS, but maybe we figure it out here. Check this thread.
http://forums.eagle.ru/showthread.php?t=89974
If you read though it you will see a few ways to get the HUD to display differently. Editing the HUD_init.lua file allows you to modify the tye of HUD. The three HUD types that I’ve found in this thread: COLLIMATOR, COMON, and HELMET.
Some photos showing how each look from my default head position, leaned forward, and right and left. Here is the link to the album so you can view them at full resolution if you want. https://plus.google.com/photos/115957688958801642530/albums/5941907042356164273?authkey=CJLnkeKoo_zTvwE
COLLIMATOR: default HUD setting in the game.
COMMON: appears to bring the HUD display back to a position on the HUD glass itself.
HELMET: Turns it into an HMD, just follows your eye point. But it does display it in a to low position.
Note that in anything other than collimator the edges of the HUD are fixed and anything that falls outside of this area is simply not displayed. This can be fixed by editing some parameters in HUD_base_page.lua. Even doing this however, you are still left with the sides of the HUD being masked by the (virtual) physical structure of the HUD.
What I am trying to figure out is if there is a way to set it to the COMMON option but then bring the HUD display back toward the pilot more. This will not give a realistic representation of how the HUD works in the real world but I think it would be a reasonable compromise.
-C