>Also, interesting figures! Nevertheless, 78claims vs. 34losses would be a 2:1 overclaim ratio. I know, Flak should also be taken into account...
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78/34=2,3
So, if you will really get into account flak losses, my estimation will not be too far from true.
26 by fighters + 8 by flak = 34 would be enough.
Though the ratio figthers/flak losses is estimated for VVS in 1944 as 50%/50% most often.
>Does anyone know the claims from the VVS side for that timeframe?
In period of May 30 - June 8: 398 claims in air combats.
For further details see the article of Dmitriy Khazanov "Battle over Yassy. The defeat of the last Luftwaffe offensive on East", Aviamaster aviation magazine, #4/199, pp. 7-32.