I quite agree, Stephen, LX's times are fairly useless for connecting flights. The 1610 Saturday departure is handy if you're coming down from Wick, as I have often have; you can catch it quite comfortably if you hop off Scottish Citylink at Charlotte Square, cross over to Shandwick Place and pick up the airport bus. Sabena is a big miss.
I have tended to use Inverness airport more and more, easyJet and once, the extremely spartan Scotairways.