Hello, and welcome to the forum.
I have an older, gently used, very good condition Loomis GL3, 14' 8/9 that has no problem whatsoever with 550/600 gr Skagit lines and sinking tips. It's listed in the classifieds here. It's paired up with a Ross CLA 6 that's in excellent condition with a RIO Skagit 550 gr line.
Been for sale a little while now so I would possibly consider splitting up the pair if you were interested. If you like, pm your email and I'll gladly send pics.