The Behlen's vinyl sealers really has no more solids than the lacquer does. It's not meant to be a pore filler. I believe it has a 15% to 20% solids content. Lacquer makes a poor grain filler anyway as it continues to shrink for a long time. There are better choices. Vinyl sealer is applied only to ensure that the lacquer adheres well to the wood. It is not a sanding sealer.
Sanding down to the bare wood each time you sand a pore filler coat only opens up new pores. You need to stop sanding just short of that.
The usual regime is:
Vinyl sealer--1 coat
Pore filler--2 to 3 coats
vinyl sealer--1 or more coats
Lacquer--as few as you can get away with for the type of finish you're trying to achieve.
Good luck.
