I don't really understand exactly why there seems to be such a big difference twixt GLA & EDI- but there certainly is one! No one could ever accuse EDI of 'Smashing them down the approach at 6 or 3 miles'
One of the differences between GLA & EDI is that the latter has about 20% more ATMs than Glasgow. That means more departures to get away between arrivals apart from anything else. I've heard "cleared immediate takeoff landing traffic at 4 miles" many times at EDI. By simple arithmetic that's not going to happen so often at Glasgow so they're more likely to have the room to bunch the inbounds up to min spacing on approach.
May also be relevant that LANAK arrivals for 05 have a lot further to go therefore more room to slow down/descend than TWEED arrivals for 06 at EDI.
NS