I have finally sorted a permanent solution to the coil pack extensions, I simply fitted another small spring inside the extension to allow positive pressure on the coil pack to plug (like on the z22se standard set up)
you could also fit a longer single spring to replace the original if you so wish 🙂
I also have fitted a set of NGK BKR7EiX Iridium Plugs, the standard saab plugs were an unknown quanity so had to go.