I've had a bit of a re-think on unit sizes and fig-actual ratio. I've been using 1:20 with 12figs (240 men) for horse regiments and 27figs (540 men) for foot regiments. This is fine but with the size of my wargames table and the overall plan to have larger battles I wanted to go for less tabletop space per unit.
After mulling things over I went for a ratio of 1:33. This gives:
1. Horse 9figs - ~300men (5 troops of 60 men)
2. Foot 18figs - ~600men (10 cys of 60 men)
This come close to actual average unit sizes I worked out from various sources. I tried out how the regiments look with the new sizes and they are ok. Mind you anything smaller than 18 figures for foot regiments and the stand of pikes effect is lost.