Hi Ken,
I am not a handy person by any means but I have eliminated the halos and reduce the glow somewhat with the double stack module.
The second pt module i mounted pretty much in the opposite direction of the first pt unit and tuned. Double stack definitely shows more detail on the disk but comparing single vs double - I prefer the single view with the 100mm.
Can upload photos if this helps others
Thanks for replying and helping me out
Regards,
m11