As Jubby wrote.

There is only 5mm between the outer limits of the posts on the deck, so not much leeway for coil width there.

I have tried it with thin MTL clapton wire (30/40 AWG, 30*2/40 AWG), but I didn't notice any improvement in terms of flavour rendition, so I'm also sticking to my usual 27 AWG plain wire (SS 316L, 3mm diam, 6.5-7.5 wraps, spaced) in it.