I'm sorry, I've not tried any of those plans, so I can't say.
But I just wanted to wish you luck whatever you decide and comment that a four-pounds-per-month loss is actually very good! I know we'd all like to lose a couple of pounds per week, but you're averaging a pound a week which seems to be a really good pace and if you're enjoying the plan you're currently on, I'd say stick it out and just add more exercise to see if that helps.
I started out with a seven-day plan and eventually switched to five-days, just so I could start learning--on my own--exactly what to eat on those non-plan days and still keep to my goals.
Anyway, good luck and I hope you get the info on the plans you're looking for!!