Buzz would fit great inbetween Hornet and NS, your problem is finding one. The Solid strike or Sure Strike would be a great choice as well and much easier and cheaper to find. The upcoming Ulitmate power would be good I am sure as well.

Black pearl reactive is a very strong pearl for me, and I think it would overlap a little with the NS. a polished Xtreme damage would give you a different look from what you have right now, but cover the same conditions
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What is sandbagging???

The TR would definitely fit between the H and the NS. I polished mine and it's very week. AT the stock 800 grit US it's a true medium oil ball. If you want it a little weaker try first 2000 Abralon, then try 4000 Abralon

The Buzz would fit, if you can find one.

A polished, or a 4000 Abralon Buzz Attack might also fit there.

Very surprised you need another ball between the NS and the BB.
Is the NS polished or drilled weakly? or
been used enough to need an oil extraction?
Although they last a long time, they still absorb oil and do need it occasionally.
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"None are so blind as those who will not see."