Next time – if using the good italian anchovies, you could use just 5 or so. More chillies wouldn’t hurt – very mild really using bird chillies.
Cook all the pasta – enough for 6. The dish will be too strong if u mix this sauce with enough pasta for just 3 people.

“Un Saporito Piatto di Fuoco

The meeting of anchovies, black olives, and peppers is a classic of the Sicilian kitchen. We always use capers packed in salt. If you rinse them, you can get rid of the salt and you’re left with the taste of the capers. With the capers in vinegar, even if you rinse them, you’re left with the taste of the vinegar."