Could you do some comparison size pictures of your ion age miniatures with other range of miniatures (if you have some Warzone miniatures would be perfect)? Thanks.
I will do but it may take a while to find any Ion Age in my pile. Also, I do not have any Warzone...
In the meantime, here is a pic by Stone Cold Lead showing a Knight alongside an old skool marine...
...you may find some of those figures that you mention alongside some Knights somewhere on the web.