I have mostly fished plastics on a 6'6"  MH BC with 65 lb pp braid from a kayak.  I have used the same set up with a spinnerbait and it feels a little off.  What do you guys recommend for spinner baits?

I throw spinnerbaits on a 6' medium rod. The 6'6" rod is fine. I am using 12lb. mono on mine. All these companies rate their rods a little differently. I have never tried using braid so I don't know how much difference it makes.

the waters i fish in use 1/4 oz. spinnerbaits a lot 12# mono medium rod fast 6'6"...works for me...good fishing...

 

It depends on the spinnerbaits. If the weights are similar a jig/plastics setup should work well. Keep in mind a 1/2 spinner weighs a lot more with blades, skirt an trailer added. 

Are you using braid for the spinnerbait too? I've never liked the feeling of a spinnerbait on braid. Other than that your setup should be fine for spinnerbaits. 

I have a M BC also, that is rated for jerkbaits with 14 lb mono.  Perhaps that would be a better setup?

I usually use my 7'2" glass MH/MF with 15lb fluorocarbon for anything up to 1/2oz. My 6'10" MH/F rod with 40lb braid will also work just fine but the downside is if you get a little hookset happy, you may pull the spinnerbait right out of the fish's mouth.

 

I find the 15lb fluorocarbon to be rather ideal. I'm using Berkley Trilene and I have no issues with knot strength (use the uni knot 5-7 turns), and it has enough strength where if I cast along a thick grass line and miss, I can still get my bait back. The downside is that it does sink quite a bit more than using 14lb mono, so if you fish a lot of rocky bottom areas, it's possible you may snag in rocks. I used 17lb mono last year with no issues as well.