When a finish is spotty, it is almost always because the wood is taking finish up at a different rate. The can be soft spots, especially along growth rings that will absorb the finish so you get an uneven top coat. Even though the acacia is a very hard wood, it is very sensitive to this problem, Because the HBFP is a very thin (high alcohol) finish it is also prone to this problem. A sealing layer is the best way to address this problem.
The HBFP will evaporate very quickly then you apply it, there needs to be a good base layer. The Walnut Finishing Oil (DOC-106) used as a sanding lubricant, produces not only a better surface but you get a sealed surface when you friction polish the WFO before applying the film finish.
A sanding sealer can also help. If I have both light and dark wood in a project I don't use the WFO (to keep the colors clear). I use a 1# cut of shellac to seal the surface, Bulls Eye Clear Coat Shellac diluted 1:1 with alcohol. Spray on a couple of coats and repeat your last grit of sandpaper. Slow down the lathe to about 300 rpm for the first coat of HBFP to allow coverage without evaporation to get a good smooth base layer.
I keep a spray bottle of this by the lathe for sealing but also for tear out. Sometime stiffening the wood just a little bit will make the cut much cleaner and reduce sanding time.