Good work on your experiments there. I find the problem in luminance rather than the blue channel (it tends to be in all channels).
So the theory its the colour correction of the scope is likely to be incorrect otherwise it would not bloat in luminance like it does.
Also I see the same issue at times with my CDK17 but that does have a corrector although chromatic aberration is minimal at the eyepiece end of scope as opposed to a refractor objective.
I'd say the problem is more too small wells. The other possibility is IR bloat which may affect all of the filters?
The other practical solution is to take a 10 minute luminance test exposure of a potential target and if you get bloated stars then pick another target. I have used the scope successfully on objects with no bright stars in the frame.
Example Trius and TEC180 images I have taken:
http://www.pbase.com/gregbradley/image/154225916/large Trius 694/TEC180 still some halos but quite minor overall not bad.
http://www.pbase.com/gregbradley/image/154487188 stars in this image seem fine.
http://www.pbase.com/gregbradley/image/154052172 stars are fine.
http://www.pbase.com/gregbradley/image/154241563 luminance and good stars.
http://www.pbase.com/gregbradley/image/156022968 Microline 8300 and TEC180 - perfect stars (same filters as used with Trius)
http://www.pbase.com/gregbradley/image/134312755 Microline 8300 and TEC180 - perfect stars
http://www.pbase.com/gregbradley/image/134561608 Microline 8300 and TEC180 bvery bright central star had a bright halo in red which was toned down in Photoshop but you can still see it somewhat. I put this down to small wells?\
I use Astrodon Gen 11 50mm square filters. They are top notch. Not sure how Astronomiks compare. I don't see blue halos specifically so perhaps they cutoff differently? Also I image with the TEC at a very dark site so that may also give a slightly different result.
One thing is for sure its only the Trius that does this. There are thousands of high end images from other cameras on TEC180/140's with no issue. So I'd say it points the finger at the Trius and perhaps filters if you are only getting the problem in the blue which is different to what I get.
What does work as a strategy on the CDK is to do shorter subs -5 minutes is my standard although sometimes I do 10mins if the target can take it. The CDK will actually burn out a galaxy core on 10 minutes on some subjects with the reducer!
Greg.