Hi Richard.
I'm putting my luck down to the fact that these - most of them anyway - were youngsters. I reckon that their slightly smaller size means that they are more likely to reach the point of no return in a trap without feeling 'restricted' by it in the way that a large adult might. That plus the fact that they haven't learnt to be as wary as the adults.
Apart from that, my advice is to tear up the so-called 'how to' books. The things you mentioned are things that I had read and tried to follow (not very successfully) in the past, but this time I just went for it.
I bought two new traps this week, and remembering what I'd read before, the first thing I did was dig a hole in the garden and stick them in it to try to make their smell less noticable. However, after less than half an hour I thought 'blow this, I can't be bothered to wait', and I pulled them out and set them. Guess what - the mole I got yesterday was in one of those brand new traps!
I am setting the traps in the veg patch, not in lawn, and the tunnels I'm targetting are not very deep at all. As long as I can open up a suitably-sized hole where I can sit the trap so that it lines up nicely with both parts of the tunnel, I don't care if the top of the tunnel is only an inch underground. I am then putting a terracotta plantpot over hole and trap, with its drainage hole covered to block out the light.
I try to remember to wear my filthy old gardening gloves to cut down my scent, but don't always remember. To be honest, as I am down at that level weeding so often, frequently exposing their tunnels by accident, I would have thought that they would be used to my scent anyway.
What more can I say, other than it has worked this time.
I still think there might be more down there - it will probably turn out to be supermole, the one with the brains that will outwit me for ever more.
Watch this space!
Cauliflower is nothing but cabbage with a college education.
Mark Twain