So having a conversation w. Anew tile installer and mentioned my bump in my living room floor. He says instead of grinding down the bump or floating they area around it-to just score the bump with a diamond blade grinder andthen power chisel a lot of it off. If too much is taken off, then level that area with self leveling mix. Genius! Never would have thought of approaching it like that, Sometimes a differ rent perspective is all you need.