Exactly. The malate form feels good for energy in the day, and for me that doesn't translate well at bedtime.
With the exception of ReMag, all the forms of magnesium have an upper tolerance due to effect on the bowel. Also, whatever magnesium is associated with, such as taurate, malate, citrate, sulfate, and oxide, works well or not according to the person's metabolism. Taurate and sulfate don't feel good to me, for instance, and oxide runs right through me.
With ReMag, start low and raise carefully. It is powerful. To fully replenish your magnesium stores, you'd need 2-3 tsp if used by itself. Consider splitting the doses into two per day.
The gold standard for measuring magnesium is to have a blood sample taken for red blood cell content of magnesium, or RBC Magnesium. The optimal level is 6.0-6.8 mg/dL. It takes at least 3 months to see a change.