Modification Design Help

[DJR1967]

So I have the Vevor 18 gallon still shown in pic#1. I've read and seen posts where adding more height to the column helps. I'm considering adding a 2"x18" spool piece between the existing column vessel and the pot top. (See pic#2) Inside the existing column is a plate and some ceramic balls and I added some copper choreboys. I have a few questions.

1. What, if any help will this help.

2. Should I put a mesh plate on top and bottom of the spool piece and put more packing in it?

3. Would there be any benefit to adding a cooling jacket or coil around the spool piece?

I apologize in advance if this has been covered.