Your congregation is incredibly stingy. A congregation that donates $300 per month with 120 publishers is very low indeed. A similar sized congregation in the UK that I did the accounts for used to regularly send over 1K GBP (= approx 1500 USD) per month. And it was much poorer than you guys - no Mercs.
" Does anyone else who still attends have any idea how their congregation is doing regarding contributions? "
The only published information I can find that gives an overall picture are the UK accounts - I would have thought these are broadly representative of the USA. World Wide Work contributions have pretty much flatlined over the last 5 years , but aren't in decline. IBSA actually reports a small increase in 2009 / 10. The average contribution per publisher is about 100USD annually.
Bearing in mind that the WTBTS has made cutbacks in literature , I would have thought that they will be OK. Most big charities rely on their trading operations to run at a small but sustainable loss , more than making up the difference with legacies and property transactions. I knew a couple of the JW NY accountants & they were quite open that the WTBTS financing model is to keep on building Bethels , assembly halls etc at a very low cost (ie most of the labour is free & a lot of the investment is tax free) , running them for a while , then flipping them and starting the process all over again as their prime means of financing the whole organisation.