Here's some advice for you:
When you make your 2 gallery free sites use 2 sets of content (one for each page), just make sure both match the niche you are submitting to. You can use a combo of softcore & hardcore in your 2 galleries and not give too much hardcore stuff away.
The secret number to how many hardcore pics you need is something you need to figure out by trial and error (or posting the links here first and getting input before submitting them
)