One thought, be sure you are using Small Rifle primers, not pistol. The primer pocket was cut for them. With the rifle type pressures, pistol primers will extrude quite commonly. If you are already using rifle primers, change to Remington 7 1/2's, they have a heavier cup material.
Just like the old .22 Remington Jet, be sure that loaded rounds are squeaky clean and free from any trace of case sizing lubricant. Speaking of the Jet, even though the .22 Jet was advertised at 2200 fps (with a 40gr bullet) real world chronographs told us 1750-1800 fps. This also proved to be about the max in functional handloads. Since the Jet and Bee are somewhat similar in case capacity, I would tend to believe you are at or very near practical limits for a working load.
You might get you hands on some Hornady 35 gr bullets. That might perk things up. BOL.