I can give a little advice, tried to brew a red IPA a few months ago, I don't have the recipe right now but I used 150g of choc in a 25L batch and it was too much, came out murky brown/black and smothered the hops a bit. I would halve that or even less for next time. Also I wouldn't bitter with galaxy, has a nasty twang to it I find. Late hop it to the moon though, the malty richness of red IPA's can make it hard to push through, I used about 6gpl late and the same dry and there was room for more.