Hi there ... I've got a similar set up to yourself with Astra 1, Hotbird and Eutelstat 9.
I've got an old 80cm steel dish with three LNBs.
9E is available but is a weak signal relative to the other two so I used the main LNB on the end of the arm to point to that one. Tricky to tune compared to Hotbird and 19E. I found 9E didn't work well with a small Sky dish, so switched to the 80cm.
I then put the next LNB on the left of the main LNB (looking at the satellite dish) for Hotbird followed by the final one for Astra 1, again on the left of the Hotbird LNB.
So, final results:
9E - ok once tuned in it was fine but the picture would cut out in heavy rain. Also my pole is an old aerial pole so it's not very strong and it bends and flexes. The old steel dish is heavy and bends the pole so I needed to re-tune it every six months or so. A better pole such as a scaffolding pole and a good tight clamp for the dish might solve this problem.
Hotbird - because you have to jam the LNB right up to the main LNB it's not in an ideal position but I did get the Italian channels which is all I was interested in though there were lots of other transponders that didn't pick up their channels.
Astra 1 - this was easy to tune and seemed to pick up all the channels as it's got a strong signal.
I hope this helps ... I'll try to post a picture of how the rig looks on my (currently dismounted) dish later today.