Getting a good line off the Glyders is really tricky. I remember a nav guide was a white rock (a big chunk of quartz) near to Llyn Cmwfynnon. This got you over the blind ridge to a point just above the Youth Hostel. By Lliwedd exhaustion is really biting hard. I cant remember too much after that apart from the searing pain running off Moel Cynghorion! What a beast!