Ahhh, thank you Frank. I find myself looking forward to your posts and curiousity was getting the better of me. Is your work intended to be fiction or non? I look forward to reading it and wish you luck at any rate.
I agree that Plutarch's account is lacking in the specifics of your question, but felt it necessary to point out as one of the few sources available. Unfortunately, as we already know, Octavian's final victory sort of taints any historical perspective on Antonius and the ancient material reflects that 'taint'. I'm not sure if you'll ever be able to get the nitty gritty of what your looking for on that account. I'm trying to recall if Appian went into any detail on this campaign, but my memory is failing me.
As for RTW, is a computer game (Rome Total War) which attempts to recreate ancient battles, campaigns and such. Its design allows for players to create their own modifications based on historic events and I thought that perhaps that might have been your goal. It's entertaining anyway.