Hi Stevie_O
I Have also the HAT figures and last week I saw the figurines of issue 120.
They are equal of size, despite the difference in scale.
See Photo:

I want to divide them over the decks of the Victory, and the masts, in the open part and in the cross section.
I think that the HAT figures are best in the cross section but on the Victory deck they looks me fine too.
When placing on the lower decks, as you did, they probably touch their heads to the ceiling. There I think, they looks a bit too tall.
But in the open air: no problem, as you can see:
I think you don't have to worry about them.
Regards
Jan Zwart
Current build: HMS Victory
Already built: Half moon, Stadt Bremen.