Honestly, just make Form Change work like it does in PvP and MNK become infinitesimally better. Just form shift thru jump phases and you'll maintain your GL without a worry. Tornado Kick might need a longer CD to compensate for how easy it would be to maintain and get back GL but at least it might finally get some use outside of a single niche purpose. This suggestion also gives room for Riddle of Earth to be changed into something actually useful for raids, like an AoE damage mitigation skill.