This may not apply to your climate, but perlite has been discussed as floating to the top of the bed after a heavy rainfall. I have experienced this when I experimented and used a significant amount in a mix. Vermiculite not as much for me but I don't want too wet a mixture either. I often get downpours and it stays too wet.
I used a lot of the black cow in my new bed and it is good stuff but heavy when not well amended. You have a good start in your leaf pile. Many board members and extension agents also suggest mixing in shredded leaves for maintaining a fluffy mix, if you have the luxury of time and the right leaves. There are post suggesting which tree leaves to use and more importantly not to use, and the timing of application.
Can't help with the pecan shells. Cocoa shells stained the sidewalk if that is a concern near your beds.
- Lisa
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