Hey Diego,
Not convinced it's just flats, but it's a good idea to get a
lightbox or a
flat panel anyway for consistency.
If you like, pm me with a step by step of your workflow and I'll try to id the issue. Mega data helps of course but getting the most out of what you have is paramount imo �� And don't be disappointed, you've done very well considering you only took your first AP image just 7 short months ago!
Cheers
Andy