As you start climbing out of the 80s, levels become dramatically slower to gain. It's regular to get less than 1% from a kill at your level. At 100, with a 300% bonus you might be getting 0.08% per kill from bashing endgame areas.
Keep in mind, some of the mobs grant less xp with the gold changes as well. It was a trade off of sorts to make bashing a little more lucrative. If you want the best xp, hunt in Tcanna. They don't drop any gold because 100% of the gain is transferred to xp.
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We haven't touched XP since the early May adjustment.