150g total hops is a bit on the light side for an IPA. Depends what you are looking for, but I'd increase the total amount to 250-300g. After that you get diminishing returns.
Also Simcoe has heaps of flavour and good bitterness so you don't need to do 60 min bittering additions with it. You should be able to get all the bitterness you need from a 20 min addition then the rest at whirlpool.
Or if you really want to do a 60 minute addition, use something cheap.
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