The definitions of those two tables are a little hard to understand correctly and probably should say something to the affect of "it uses the vane tables when the main rate goes above X and uses the boost table when the main rate goes below X" you know something like that.
But yeah what i did in order to eliminate the boost tables was set both tables at 200 so that the ECM would reference the vanes only and throw desired boost out the window and eliminating the possibility of getting a boost code too. so lowering them should net you the opposite result.
without seeing your log vs. the tune i would bet that the vane and boost tables are mis-matched and the main rate is varying so the the ECM is falling in and out of the main rate that dictates whether or not it is supposed to use the vane tables or not.
Just a guess.