Heya Wanderer, welcome back!
To me, what does and doesnt look good on a resume can depend on
what youre planning to DO with that resume in the future.
I also dont think that a change in title automatically means a step backwards.
Its the work youve done that counts. And also your reasons for the change--
in this case youd be moving to a more known/reputable place with opportunity to
learn, so obviously you want to better youself.
Problem i see is more about the pay--once you step that down it can be hard to get it back somewhere else. But not necessarily, depends on position etc.
Personally you seem to be one who strives to better youself...I would keep my eye on that ball for now.
-Meez