140Pending, you should not have to wait 6 months btwn SRs -- I was told by USCIS 60 days. (My employer's lawyers were the ones who opened the requests.)
I finally did ask my Senator (virginia) for assistance after the 2nd SR -- I only had to provide details of my situation and privacy permission in writing (faxed a letter with details per instructions on his web site). A week later, disappointing snail mail from the Senator's office with the same update I'd been getting (my case is with an officer, no estimated time etc). However, another week later, I received email update from USCIS stating my case was approved.
Regarding your case details, your previous employer's lawyer should provide this, or at a minimum the case receipt #. If your current lawyer can't get this, you might try USCIS customer service.