I would change the 055 tripod for Benro's 3570 series carbon tripods, or better yet, the 4570(bigger brother ... larger tube diameter).
I have a 055 and it hasn't been used in many years, simply because the carbon gitzo type .. (ie. same as this Benro model) tripods work so much better.
There's also another Gitzo knockoff brand that also comes from China, but I have never seen them in action properly.
I have a Gitzo personally, and from what I've seen and experienced with the higher end Benro legs, such as the 3570 series and 4570 series, they're pretty much equal to the Gitzo.
A few minor detailed differences, but they're not very significant.
3570 is approx $380, 4570 is approx $480, local prices.
BH-55 is a top notch piece of kit, in many respects worth the money spent(now that the Aussie dollar is worth something).
But it's not infallible. I've written up a small piece on it, somewhere in our archives, and I should take the time to revisit the issue I had with it.
HERE's my story on the issue I had with it.
Basic rundown of the issue I found with my BH-55 is the way it drops and mis-frames the scene compared to how I want it to be.
That test was using a 300/2.8 with 1.4xTC over a distance of only 4m, so a large lens was used with a bit of magnification to make for a 'worse case scenario'.
That was over a year ago, and one of the other issues with the BH-55 from new was that it feels very stiff when it was new.
I haven't compared it to the other heads I have again since, and now with a year of use, I should .. just to see if it bedded in as I thought(or hoped) it would.
In use, the BH-55 feels very smooth now and easy to balance a large lens on it with minimal locking force .. I just haven't compared it against the MG468 in the last 12 months.
If I get an opportunity, I'll update that old thread of mine. I can't exactly remember the results of actual stability tests, and again, if I get a chance I'll see if I can update it.