I have to say my MAXX is basically the same as what the OP described. I just pre-ordered the Note 4 right after midnight when pre-orders opened. Dropped full price for it to keep my unlimited plan. Can't wait. My guess is that I'll be making much more use of my data plan with a newer phone that most likely won't lag.
For now, the wait to get the new phone will probably be 4 weeks. I think it comes out Oct. 17th. My MAXX is rooted, with Safestrap 3.65 installed. I'm going to look into the latest ROMs so that my phone is at least usable for now. I suggest you do the same, if you can. I've posted the same video numerous times on how to install Safestrap and install a ROM, I just searched YouTube and found this guy's channel whose installed SS and ROMs on SEVERAL phones. I think he goes by "RootJunkie.com".