Just because they're pretty far behind Japan doesn't mean they're going too slow. But I've noticed One Piece HAS been getting more chapters per month than it used to. They were going pretty slow for a while, but now they're making really good progress into Alabasta. It's slowly but surely catching up. Though they could stand to up the pace a little more. I still look forward to each and every month's issue, since I haven't read a lot of this in any form (I just watched the anime up until Davy Back)
Though it shouldn't be at the expense of titles like Bo-Bobo or YuYu Hakusho. They're good, classic series and people actually read them (I know I do… I can't find any B^7 scanslations past Ch 20, so Viz is my only hope here). If they want to make more space for One Piece or something else, they should take out Yu-Gi-Oh! GX (honestly, does anyone even read that? The original YGO manga was great, but…), or even, God forbid, cut down on Naruto and Bleach a bit.