Those macro shots and colors are looking good!! Was that with post processing? I use a Tiffen 85b filter as well. With my camera (Fuji X-T20), there's a kelvin scale I use to manually adjust the white balance with the filter on to get it as color accurate as possible. Anything similar with your camera?
I have not done any post processing yet, still focused on just learning the camera stuff.
My camera has 3 options to manage white balance:
1. I can choose an image to use as "custom white balance" where apparently you shoot a grey or white card and then assign that pic. I have tried this but it comes out way, way too orange. I have tried both grey and white cards, not sure how the camera is supposed to know which (they both obvi look pretty blue in the pic) but needless to say I haven't had much luck this route.
2. I can adjust the Kelvin like you said, up to 10,000k
3. I can adjust individual color balance (magenta, blue, etc) to fine tune whatever the above gives me.
So far the best result seems to be going with 10,000K, using the 85b filter, then actually adding a couple ticks of blue back in to move the balance back to the cooler side.