Well, first off, most coaches would say the 3 non-FB offenses are similar enough that you can treat them all the same. There may be some nuances with each of them, but the differences between them are much less than the differences b/w any of them and the FB offense.
FB offense is all about ATH and SP. You really need to commit to those skills -- along with DEF -- and if you run FCP with that, which is a logical connection imo, then you also need to treat Stamina with much more respect than you might otherwise. Your team stamina needs to be ~80 by the end of each season if you go FB/FCP, and you have to be at least 11 deep if you run that combo. If you go just FB (which I haven't done), then maybe you can get away with a R/S each season. FCP also relies heavily on ATH and SP, so since you have to commit to those skills for the FB offense, it makes some sense to just go FCP as well. Most coaches poo-poo FB, but if done right it can be powerful, but again, the key lies in getting premium ATH/SP along with high ST and DEF.
Your current players have good ATH and SP, but really I wouldn't deviate from the Triangle/MM combo it's currently running. You should experiment with FB or FB/FCP at D3 before taking a well-built D2 team with good prestige down that road imo.