I have a variety of airbrushes, Iwata, Badgers and Paasche, but at the spray booth I almost exclusively use the Bager 100G, 100LG and the lastest Sotar 2020. With the number of different size nozzles available, wide area to finer detail spraying can be easily done.
For my use I think a very important part of finer detail work, like camo borders, is finding the best thinning ratio and PSI combination. Using Tamiya acrylics, the free hand really fine borders are routinely done thinned at about 70-80% thinner, X-20A or 71% alcohol, both work well, and usually at about 12PSI. Several light passes work better than a single heavy pass.
I agree with other posts, your HP-CS is certainly capable of doing whatever job you require. Mostly a matter of acquiring the ideal needle/nozzle combination, then finding the right paint mixture. Experimenting will get you there.
Good luck.
I currently have an Iwata HP-CS for most of my work and an HP-TH with the fan tip installed for broad coverage like priming. I love both for their intended purpose, but am considering adding one with an even finer spray pattern for detail work. I find that the HP-CS is just a bit much for free hand camo on 1:72 scale jets and haven't been pleased with the results masking it off.
Am I chasing a futile endeavor?