Kill claims are notoriously overestimated during this period, frequently by ratios of 5:1 or more. The only reliable way to estimate kills is to look at enemy records and see how many aircraft were recorded as lost during a given period.

Take a look at some of the entries here; April 17th stands out.

https://en.wikipedia.org/wiki/Confirmation_and_overclaiming_...

"the 91st and 306th Bomb Groups claimed 63 German fighters destroyed, plus 15 probable and 17 damaged. Only two were confirmed destroyed, with nine damaged."