Hi, could you please let me know what you mean exactly by "optimize ad space on homepage"? Would you want to add more ads, or do you need to move things around so the ads are more visible? Will you be giving specific instructions as to what you want? If yes, could you please post them here in short?
Adsense can be added to the forum, no problem.
I am currently working on a CMS powered website running invision, and also have extensive experience with php scripts and templates customization.
Expecting your reply,
Iskra Angelova