Bad Master Cylinder?

[clean2g]

I'm having some weird issues with my clutch pedal I think, but the actual clutch has only 5000 miles on it and the tranny only has 3000 miles on it. I'll bleed the hell out of the clutch and it'll be fine for a few days, but then it gets soft again. And now it even feels like it's kind of slipping. Also, while driving, when I try to shift sometimes it won't go into gear for a few seconds. I've tried adjusting the pedal rod but the same thing happens no matter how much I adjust it. So my question is, would this be the symptoms of a master cylinder going bad? The car is a 97 gsx, act 2600 clutch, resurfaced oem flywheel, shep rebuilt trans, mbc @ 15psi, catback exhaust.