Max and I had a look on Wednesday and everything seemed in order. Seems that my issues last weekend were down to user error. Max had a look at the blades and deemed them in reasonable condition. We made no changes. The couple of test passes I did afterwards were as good as one may hope I think.
We didn’t have time to run through the standard exam procedure, nor did we get a chance to talk about the position of the air supply.
One thing I did learn, which is a bit obvious in hindsight, is that there are two locking knobs for the infeed table, one on each side. The near side one is very obvious and is by the depth-of-cut scale. The other is on the far side, tucked away behind the vertical fence. I’d never noticed nor used the second one until yesterday. You need to loosen and subsequently tighten both when adjusting the depth of cut.
It is possible that the far side was loose while I was making cuts and therefore the table wasn’t solidly pressed down, or even worse it may have been tight while I (or the previous user) adjusted the depth of cut, which would have tilted the infeed table.
There’s no hard evidence that that was the cause of my issue, but it is the only thing I knowingly changed.
That is definitely why you are getting wedge shaped results.
Maybe the @woodtechs should set it up to a fine cut and then stop allowing depth of cut to be changed, you will get a better finish by going slower and the blades will last longer