Neighbours traditional slot is 5.35pm. In this multi-channel age, it is important for shows to stay in established slots.
What they could look at is moving the lunchtime slot to say 12.00/12.30pm...which was it's original time slot on BBC1, back in the day.
At this juncture, it is also worth remembering that there are now many more opportunities to see Neighbours - which is a good thing - but it means the audience is split. Lunchtime, teatime, lunchtime+1, teatime+1, 5*, 5*+1 (in some cases), omnibus, omnibus+1 and online/On Demand. That is possibly ten times or more. All told, it is probably doing 2.5million per episode...but we all know that ratings don't reflect quality don't we.
Channel 5 really should be doing some high profile / peak time promos...and if necessary...use the other commercial networks to. The show is in a good place right about now, and the masses need to know about it. It is better, in my view, than some of it's prime time counter-parts on other networks!