It must be something in the air just now. I've got that 'got to bake a cake' moment going on too .. except my 'can't find' was baking parchment!
I bought some flour in France that claims to be SR ( well, I think that's what 'avec poudre levant' means) and I'll try that one for starters.
I'm thinking your & my threads could merge for one huge cake thread

If your cake works out fine and mine doesn't, maybe we can swap do's and don'ts - or maybe you can bake a cake for me, too