I've been having a great time getting to know my press, I've only been able to get two evenings at it so far, but now I'm at the stage that I know what questions I need to ask to improve my impressions.
Here are 3 impressions. (This is from a 3 1/4" x 5" engraving.)
A is on newsprint and crisp with good blacks.

B is on Zerkall, I had a problem getting the black rich without the fine detail filling in.

C is on Zerkall too, but shows the fine detail, although the black is a bit spotty.

I made 40 impressions, adjusting the packing to get a consistent result, but it was still hit-and-miss.
I wonder if my inking isn't consistent, rather than the packing and impression? I do try to roll ink onto the block evenly and lightly, but it varies widely. Also I seem to need to keep topping up the ink on the slab every 10 impressions or so. I didn't roll out a massive amount , just an area a bit bigger than the block. Tried to keep in mind the advice of making it hiss slightly and it should look like a mole's tummy (I do like that expression!). So I think I'm asking for any ideas, advice, thoughts that could help me.
Should I concentrate on getting consistent results with newsprint before I try more expensive paper?