KimC

Hi from another yellow belly using Fuji. 

I don't find a problem with mine. The metal hoods seem to go on much better than the plastic ones. You need to line it up (the white dot on the hood against the white line on the lens and then a 1/4 turn. 

That should be the right one. Not used their Nikon one but have used their PK, LM and 645 ones. All work well.
 

The newer version has WR, better stabilization, a numbered aperture ring (original had ring but you had to look at screen for f-stop), and a lock for the auto setting on the aperature.

It depends what mount the Tokina lens is. I find the K&F ones work well. 
https://www.kentfaith.co.uk/KF06.101_nikon-f-lenses-to-fuji-x-mount-camera-adapter
 

Hi Baddoch. I have followed a similar path from Pentax. 
It depends on your perception of small/smallish. If you are looking for something to act like a normal "pop-up" flash, the EF-X8 works well. 

If you are looking small, I would look for the Godox TT350-F. I pcked a couple up second hand from LCE around £25 each. (Think Pentax AF360 FGZ but a bit smaller)

If you are after a "full size" one, I would go for the Godox V860III-F. Just before Xmas I picked a couple up brand new from Amazon at £91 on offer with a voucher. Fantastic flashes with Lithium ion batteries and fully compatiple with the Fujifilm TTL modes as well and integrating with the other Godox units and guns including the TT350. These are still available on Amazon for £153 but there is a voucher code for 30% making them £107, Compared that with over 4x for the Fuji unit which is less flexible.