To get everything out from x-ray engine, you must use these preferred settings!
Make sure you've started the game atleast once and setup the settings from settings-menu.

Navigate to _appdata_ folder at root of CoC, and make a backup copy of "user.ltx".
Now open up "user.ltx" file with a notepad of your choice.
Search for a line called: "r2_gloss_factor" and fill the settings as below. (ctrl+f)
...
r2_gloss_factor 			6.9
r2_ls_bloom_fast 			on
r2_ls_bloom_kernel_b 		0.7
r2_ls_bloom_kernel_g 		3.0
r2_ls_bloom_kernel_scale 	1.0
r2_ls_bloom_speed 			100.0
r2_ls_bloom_threshold 		0.69
...
r2_ls_squality 				1.0
r2_ls_ssm_kernel 			0.7
...
r2_sun						on
...
r2_sun_lumscale 			1.0
r2_sun_lumscale_amb 		1.0
r2_sun_lumscale_hemi 		0.4
...
r2_tonemap 					on
r2_tonemap_adaptation 		1.0
r2_tonemap_amount 			0.9
r2_tonemap_lowlum 			0.3
r2_tonemap_middlegray 		1.6
...
renderer renderer_r2.5

Save it and start Call of Chernobyl!

If something fails, you can always reload it from backup file you made.