Try this, haha. It probably sucks, but it'd be nice to see how it goes, I read about it/something similar in the archive of BBF or whatever it was, posted by Brad.
It's supposed to be a weight-based defender, and if you feel like trying it out, let me know how it goes, I'd be much obliged.
AR: Samurai Upper
WD: CWD Defense Ring
RC: Battle Change Core
RC CWD ABS Part: CWD Free Survivor
There's also that really crazy attack combo in the Slash Riger article, though I'd be wary of breakage.
AR: Slash Upper
WD: 15g Circle Wide (Draciel MS)
RC: Grip Flat Core.
Now, from what I read, Jiraiya Blade smash combos don't work on high speed but high rotational velocity, despite what the top-tier list says, and I'll be investigating that myself once all my stuff gets here.
You may wish to try the one in Jiraiya MS's Article, and see how it compares to something more traditional, or at least, the same as in the article with Grip Flat Core. Again, let me know how it compares, if you would?
Oh, and obviously for defense just use something of the competitive combo list, you have the parts.
Your collection is very nice, very similar to my "things I have bought/will buy" list, in fact.
Oh, and do note, there are obviously a huge range of customizations you can make, these aren't really the best, but they are the more interesting ones that come to mind.