No specific comments, but not all plants in a genus like the same growing conditions. So perhaps they like cooler nights than you can provide, or are less water tolerant, or otherwise your growing conditions don't suit for those particular plants.

I grow a lot of sedum. I can only guess what the issues might be.........

Sedum dasyphyllum - I have trouble growing this because it does not come back after our harsh winters. You should not have any trouble growing this other than maybe it would do better in more soil vs a lean sandy soil.

sedum oreganum - Comes from cool moderate temp zones. It is may be having trouble with too much heat and sun in your area.

sedum spathulifolium - This is a name of a group of sedums. There are many different spahulifolium. So I cannot tell you what could be the problem with that one. This group of sedums run from hardy that will survive in my zone to tender that only survive in warm zones.

All I can tell you is if it does not grow well in your garden buy others. There are thousands of beautiful sedums. If one does not work there is usually one that has a similar look that will do wonderful.

The other thing you could try is the ones that are not doing good in gravely soil. Try planting those in richer soil. Some sedum really do want more water. They do not all want to be dry. I have put large rocks around the ones that I want more soil, lift them and put a couple hands of compost, good potting soil and plant them in the better soil in that area. The circle of rocks makes like a separate pot like area for the sedums that like better soil.