mmm....funny that Nick either the rules have changed in the last couple of days or the person you have spoke to hasn't got a clue what they are talking about, what they should of said was apply no earlier than 28 days before your wife's completion of her initial 30 months residency...
With the dates you have given me then my information is correct I would definitely speak to CAB who would further confirm this, think our resident expert in this field will also confirm my advice so just hope Terpe can input also.
Anyway Nick wishing you all the best in the future...
Mark...