From reading here, it leads me to think that capital losses on separate property (i.e. held in one name only, acquired pre-RDP) can be incurred by each partner. I believe taking line 11 adjusted gross income from the federal 1040 across both provides the community income. The one adjustment I had on my end was reduction in income given HSA contribution.
https://www.irs.gov/pub/irs-pdf/p555.pdf
