An SPE should eliminate most of the slippage.
The pad. If you keep that under you it should take you to at least 40 degrees. I push/pull the edges of the quilt under my shoulders, but if you are laying on a bag and compressing the insulation below you, you aren't getting any value from it anyway and it is probably contributing to your pad moving around. Leave the bottom of the bag zipped for a foot pocket.
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