Ron,
Haven't use the short or compact skagits much but if I had to pick one regular skagit line for both, I would likely opt for the 600 - pretty sure Mike M likes a bit more grains on the 1287 than the 550 so while 600 may be a bit heavy it should work. I have actually played around with the 650 on the 1287 and it will cast that line.
I also think you would do ok with the 570 compact. I think the 540 would be light on the 1308 though it has been a long time since I cast that rod.
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