This may be too simplistic a view.
I agree - Glasgow also get a hell of a lot more Heavies (767s, A330s and A310s) and Lights (DHC6s BN2s and C310s) giving more complex vortex wake mixes, I think Edinburgh is much more Medium/Small oriented - so you could argue that the extra miles spacing required in the Glasgow sequence use up any 'spare capacity'. The old "bigger aircraft/bigger gaps" conundrum.
However, most of Edinburgh's traffic comes up from the south, where a reasonable %age of the Glasgow traffic is mixed from all directions - still needs spacing on final, but more tricky in the Embra case if they are all coming up through TLA.
I still think they should build one Central Scotland airport at Grangemouth/Stirling with dual runways. Let Glasgow do the North Runway and Edinburgh the South - that would be fun
