I also would be interested in this.
I report my small UK state pension on my US return as per the advice of my accountant. For me, all it means is that I get fewer Foreign Tax credits than I would if I did not report it.
The SSA and WEP at your initial disclosure does seem to be a trap for the unwary. SSA Maryland gave me varying advice, including 'you only get WEP'd once'. It would have been very beneficial to have had professional advice.
An additional bummer - as I recall, the amount of back payment of your UK pension is considered to be a 'lump sum' by HMRC. It's untaxed and might mean you have to file a UK tax return to pay tax on it. Having been put on their list, it also might mean they require you to file them in the future, for a few years at least. (I should say that my experience was a UK state pension based on my own NI contributions; no spouse was involved. and I'm a UK resident)
It doesn't sound like you have a 'foreign' element, ie., that you're 'combining' US social security in the determination of your UK state pension - but if you are, get ready for truly surreal dealings between the DWP local pensions office and their overseas division.
If I had it to do over, I would get every word of advice I could and understand the whole field before beginning to take any pensions.