FTMO leverage is not a position-size suggestion
Euphoria after 3 wins and proximity choking near the 10% Phase 1 target are the usual reasons the spike appears on FTMO books. The detector does not need the reason.
Fee math: one spike versus $540
The $100,000 Challenge fee is about $540. One 4x lot ticket that fails daily is a more expensive lesson than a month of 0.25% compounding. activate Venasri free on your MT5 account so the spike is visible while the fee is still recoverable in process, not in a retry checkout.
Cap the ticket, then cap the day
Do not use a second FTMO account on the same VPS without isolating magic numbers. A spike detector that mixes two logins will lie about the 50-trade mean.
Half size in Phase 2
Phase 2 is a 5% target with the same 5% daily. There is no room for a 2x lot jump. If Phase 1 was traded at 0.50%, trade Phase 2 at 0.25% and refuse any ticket above 2x that new mean. Funded 80% split (scaling toward 90%) is the prize. It is not paid on a spiked Challenge ticket.