saguaros been quite sometime since your answer, sorry for not replying before, but haven't got the time to work in this side personal project 'til now.
Your solution works well, but I've got an important issue with it. If I put a big logo that can be seen alright, it takes over anything appearing under it, and when header changes to scrolling looks strange. but If I put a logo that doesn't take over the header size, it's too small.
I'm stuck here >.<, is pretty important our logo is in the middle, as per the logo design, is not too viable on a side... u_u