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I elaborate when it's appropriate, besides that arguments been done before heh. Joe Blo may not know how to fix something but he sure can tell you it's broken :P Doesn't make him a troll for doing so. Mappers job is to research, learn and solve problems brought about by user comments on their submissions.
Every now and then they get someone like myself or another mapping advisor onsite who can do hands-on help and fix up their map vmf files.
Generally, Submissions are for critique, threads are for step by step help and explanation. Any issues with mapping/texturing just throw up a thread on the forums and myself or other mapping advisors will be able to answer it in quick order.
In regards to mapping, I've been doing it for 10 years now heh.
To help reduce texture sizes - such as the case with the radar image - you should create it without any mipmap textures. Using VTFEdit, just uncheck the "Generate Mipmaps" and it'll cut your radar images down from 5.33mb to 1.0mb.
Mipmaps are useful for performance when textures will be viewed at different distances but with an overview file it'll always be at the set scale.