If your plant doesn't wilt while the soil is still moist, the necrotic areas on leaf tips and margins is from over-watering and/or a high level of dissolved solids (salts) in the soil solution. The best fix, and the one that makes the most sense, since it will rid you of both issues, is to get your plant into a soil that allows you to water correctly w/o worry that you'll rot roots or your plant will suffer from diminished root function for days on end. There ARE ways you can deal with excess water retention, and now isn't a good time to be repotting, so my suggestion would be to start a conversation centering around dealing with excess water retention for the temporal, with a projected plan for next summer that will get your plant back on track. You can't expect a happy plant if you can't keep the roots happy, and fighting your soil for your plant's vitality surely isn't a good way to improve your proficiency.

Al