Going from4 to 8 tables, transition question

[jokerthief]

What kind of ROI drop can I expect going to 8 tables in the $55's after I've gotten used to having 4 more tables? How about the $33's?

Also how hard is the transition and how long does it typicaly take? I plan on dropping down to the $11's and playing until I've won ten buy ins before moving up. I'm going to do this for the $22's and the $33's as well. Any other info on this transition will be greatly appreciated. *FWIW-I will have a two 2001fp set up.

Thanks

***Edit, I do plan on moving up to 6 first. I just want to know what to expect at 8.