Phillip,
I have been using Fabriano Aristico - mostly cold press but hot press also. You mentioned sizing, I have not needed to size my papers. You also mention adding gum to the VDB mixture - I haven't heard of that before. I do add a drop or two of Everclear (190 Proof grain alcohol) as it seems to help the paper to absorb the solution.
I also use the 2% citric acid that Joe mentioned.
You mentioned the Richeson 9010 brush. I have one but only use it for Platinum. For VDB I usually use a Hake brush - I got 8 of them on sale for $15. They have a shedding problem at first but when that stops, they are very good for a number of processes. I dedicate a brush to each process to avoid contaminating one process with another. I have also used a glass rod but, for VDB, I prefer a brush.
As for the color after coating, I always double coat and my emulsion is always yellow-green.