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I believe this issue is caused by the custom client.dll used by other mods, which may not include the HUD scaling functionality, as it's also an issue with They Hunger.
Example:
At 1600x900, Counter-Strike's HUD is easy to see, but at higher resolutions (mine is 2560x1080) it's tough to see. Valve solved this problem with Half-Life by making scaled versions of the HUD elements, but as far as I know, they haven't done this for any of their other games that use the GoldSrc engine.