Based on boiling 6.50 gallonsliters at 0.899 for 90 minutes, this will decrease your wort by 0.00 gallonsliters, bringing your after boil OG to 0.899. You wanted an OG of 1.088. It looks like it will be under.
Did a quick gravity test today and it is at 1.044. The flavor is on point. The sweetness is starting to ferment out, and it has nice malty bitterness without tasting hoppy.