Thank you for the welcome derrickdj1. These are the first Klipsch speakers I have owned and they are an entirely different beast than I am used to.
What I am wanting is what is needed for home theater and that only. If you are running a sub and your speakers are crossed over at 80 hrz do you really gain anything by the extra drivers in tower speakers? I used to come from the bigger is better camp when it came to mains but if you are crossing them at 80hrz what benefit are the bass drivers in a tower? For music full range, yes I get that but for movies I am trying to decide if I will get much if anything from upgrading to towers. My room is bigger so that's my dilemma.
Yes, running the large RF 7's set to small with a sub allow a 3-6 db improvement in midrange performance. The RF 7 speaker cones don't have to produce the low bass frequencies. This result in less cone movement, which equals less distortion. Also running the speakers set to small minimizes phase issues and cancellation problems between the mains and the subs. The redirecting of the bass to the subwoofer also increase the system overhead and power management potential. This is especially significant if using an avr with lower wattage
What center do you have? There is no way around not having a good center speaker for HT. The RC 62 should be all you need if you are using the bookshelf speakers. Demo some HT and see if you are really missing something. The big impact speaker for HT is the subwoofers and not tower speakers. Setup is the key. This will help get you the soundstage that you are looking for. Getting the mains more than 8 ft apart for me made the soundstage wide/larger and using front height speakers fill the top of the theater area. The front stage is a wall of sound. Having more headroom is paramount when using smaller, less efficient speaker. It is not ususal to see surround speakers to need much more power to reach reference level than the large towers. Put up your signature then it will be easy for other to see what you have and make recommendations.
So I would gain in output and clarity by running towers crossed at 80hrz versus my current setup with the RB81's? If that is the case then maybe the rf 62 would be the way to go with my larger room.