I would lower the Melatonin dose a tad bit (Apologies, as I'm rather tired and don't feel like looking it up) But I would cut the Melatonin dose in half. Hydroxyzine, you should be able to knock it down to 25mg's. Dropping the Temazepam dose is up to you, as 10-20mg's is my sweet spot on the rare occasions I take it for sleep.
@Neithman They are both pretty great anti-histamines. For sleep I'd put Promethazine > Hydroxyzine. Same effects. Promethazine is just a bit more powerful in my opinion.