Never enter a standard lot simply because account margin permits it. Professional execution calculates lot size backward from the invalidation price level to ensure risk never exceeds 1.5%.
Carl Brent Anthony Institutional Rule
Lot size must always be calibrated backward from the stop-loss distance to equal Account Balance × 0.015.
Cross-Market & Execution Note
Direct application of the Ebook Section 2 position sizing formula to FX margin rails.