Issues with new Kentia

[Kariri]

I recently bought a 2 foot Kentia with one 3 foot frond from Etsy. It is 2 palms. On arrival, I noticed that there were black dots on the stalks , and other mild blemishes on the fronds. The pot was damaged and some of the soil was displaced. I wanted to repot it and use new soil and used this forum to look at various threads on potting mixes.

I couldn't find pine bark, so I used fir bark. The mixture was roughly 30% FoxFarm Ocean Forest potting soil, 20% Fir Bark, 20% Hydroball (a Leca substitute), and 30% Pumice. I then watered it. It seemed to dry out quickly, and after a few days I noticed yellowing tips on many fronds, so I googled "yellowing tips on palm fronds kentia" and it returned that it may be a sign of underwatering, so I watered it again 3 days later.

Now I notice yellow transclucent dots on the tips of many fronds. I also notice a few dots of black circles within a yellowish halo -- may be fungus? Is it fungus? Overwatering? Potassium deficiency? I also read that yellowing tips and circles at the tips may be a potassium deficiency? The Foxfarm is pH 6.3 - 6.8, but fir bark is acidic? I am new to houseplants in general -- I've noticed that I kill most plants through overwatering than anything....did I overwater?

I picked the Kentia because it is considered the most hardy, plus, I really like the way the fronds curve, but she is my first palm. Any advice would be appreciated, thanks.

[Kariri]

Here are pictures

[piping plovers]

Kariri, How is the Kentia doing?  Out of curiosity, I checked my Kentias and noticed that some of them  have occasional black marks similar to your photo.  Likely, a bacterial spot and it could have occurred from growing conditions awhile ago.  There are none on any of my recent fronds, so it has passed through that issue.  I don't know what the other spots are.  For the last pic, you may want to look through a magnifying glass to see if there are any red spider mites/webbing.  The soil mix you are using sounds fine.  It is better to error on underwatering them indoors than to overwater them.  When you water, give a thorough, drenching watering, dump out the excess water from saucer and then do not water again until top 2" soil feels dry to touch.  I wouldn't be too concerned about a nutrient deficiency  - as long as you cover the basics (bright light, watering and regular fertilizing) I think the rest fall in line.  I've been using a generic houseplant fertilizer (diluted every other watering) for over 20 years and mine have always seemed fine with that.  Photo below of my Kentia that I have grown indoors (winter) for over 20 years.  Lastly, you may want to use a black marker to mark the progress of the growing spear emerging from the center; check it each week.  If the mark is moving upwards then you know it is growing.  Keep us updated and let us know how it goes.