Also the site states 2 further Bv138s were shot down on 8.5.1944. I had assumed the kills were so similar that they were a mistake with two dates describing the same action however this site
http://www.naval-history.net/xDKWD-HF1944b.htm
confirms the destruction of 4 Bv138C in May 1944. I know from past posts that SAGr.130 lost two on the 6th and another on the 8th.