Sounds like your doing fine. The amounts of documents required seems to have dropped for now. But the quanity sounds just to low to me.
Ideally you want a variety of official paperwork addresses and dated to to you as a couple. Also from the way we were asked when we went in person the lady would say ok i need one from oct 05 jan o6 etc.
Ensure all months are covered.
If a newspaper hears that the quanity has dropped and makes an issue of it as its a quiet week it could easily rise again due to net curtains being twitched.
My adivce is to aim for 20 over the two years or more as per last years regs just in case. Elections and hardtimes are htting the country visas and
Immigration in particular are a good area to meddle in it seems.