Finally!
I have fought (all the afternoon) with Oo1.86 to make it work as smoothly as Oo1.84.
I have found out that I did not need the .plist thingie. It was just a matter of 'too much textures' and related *.oxz.
So I un-installed the conflictic ones and made sure that I got a 'clean configuration/installation'.
Oo1.86, on my computer now, is kinda-like a 'custom Oo1.86'. Not really 'full', not really 'basic'... Let's just say 'average'.
Some little lags, still, but nothing to worry about. The 'wormhole problem', well, let's get started to wait a bit between systems, right?
And, NOW, I have HomeSystem installed.

(I need a break, now : my nerves...)