Mr Er

How about
(1) joint bank account in benefitiary's country
(2) Tickets, invoices, boarding passes of honeymoon trip (having both person's name together)
(3) Invitation of any function or ceremony stating both names

Getting depressed or sad and sit around computer won't help you. Call USCIS and talk to tier 2 person, ask him clearly whether your waiting clock starts again after transfer ? and listen what he says,,, automatic voice system can be used to filter down no. of callers.
Check my time line, I am same as you, and I called those guys and asked about this for 3 times. Every time tier 2 people said that clock does not start over again. Although transfer game adds little delay to the case. And you can always request service request after 180 days. I have got the same info from all tier 2 person in my last 3 calls.
Hint to you... google the phrase 'USCIS Ombudsman'

Well I am also in a same boat (which I almost started to believe a sinking TITANIC until this morning. I am June filer and my 5 month frame period is very close to pass. I called USCIS and luckily I was able to reach to reprentative and he told me that transferring case to other service center does not affect 5 month period, it does not add up more months and you can always call back when you are certainly out of stated 5 months period. He also told me that reason for this transfering is that now Texas office is processing special cases which may include finalizing process as well (although his first words were I AM NOT SURE BUT......)
Which may prove good news for us..
hope for the best