Yes, you're right... Mathematically, I know I can be fine with less, it just makes me feel uneasy. I was actually trending towards a lower percentage, but I got scared and depressed earlier in the year. I sold off some poorly performing stocks and ETFs, giving me some more cash cushion. It felt like the sh*t was really hitting the fan. It still does, in many ways, just not for my investment accounts. When (if?) things "go back to normal" I will re-assess...
I suspect if you know not to trust yourself to stay the course when the sky is falling, then you are in fact probably better off in the long-run with a less risky asset allocation. There’s plenty of evidence out there to show that the more you buy/sell/tinker, the more likely you are to get worse returns. Literally the best investors are dead people. So if you need some % of cash or bonds to stay the course and do nothing, that’s good. Which shows some self awareness and maturity. Ideal would be to dispassionately follow the math, but your strategy is the next best thing.