IG’s info about US Tech 100 Cash (1€) (NASDAQ) reads:
- Minimum STOP distance ……………… 8 (pips or points)
- Minimum STOP distance (guaranteed) 2% (percentage)
those figures are usually not fixed, but may be increased by the broker in case of unusual volatility.
So you have to first know which one of the above minimum requirements is applicabile to you, then try to raise that limit a bit to keep your code running smoothly even when volatility is unusual.