Well, I gave ya plenty of reading material.
The side thing should have been covered in at least one of 'em.
I'm positive Pendragon made such a comment in his circular/linear LNBF thread.
I think you'll have an "ah-ha" moment pretty soon, and this'll all be clear. -
As for the switching, there's not really enough info to say what would be best.
I recommend the Switches Simplified FAQ (naturally) and maybe post #6 with eight LNBs as something to try.
Lastly, regarding the swapped polarity of your add-on LNBF, it looks like it's rotated 90° in the pictures, so... V & H should be swapped.
That would depend on the 22khz switch. Ecoda 22khz switches will pass diseqc commands through them but many others will not. The 22khz switch in a universal LNB comes after any diseqc switches so this wouldn't be an issue. You won't hurt anything by putting a 22khz switch in front of a diseqc switch. If you find the diseqc switch doesn't respond, it's due to the 22khz not passing the commands along.