Thanks for the comments and feedback folks, I appreciate them.
What a difference a month makes – I have had several epic fails, the last one earlier in September.
Since then, I simply rotated the OTA in its mounting rings and lo and behold, Phobos just popped right out of the spider diffraction spikes.
I was totally surprised at how easily Phobos and Deimos were revealed once I had rotated the OTA in the rings – thanks Matt (he designed and provided the Mewlon rings).
Cheers
Dennis