Solid read dude. I've tried the west coast IPA yeast from mangrove jack (m44?) and I reallly think I just under pitched, with old yeast, and really did not like the outcome. Reading some of the tasting notes compared to the recipe I do think you went a little light on the hops for an IPA of this style. I'll do three types of hops at 56 grams each split into to two dry hops, or 168 grams total dry hop, and the same amount for the whirlpool. That said, I tend to knock down the amounts for the single hop APA batches, going 112 grams total whirlpool and 112 total dry hop.
On a side note, how are you rehydrating your dry yeast? I'm not sure if anyone else does this, but I actually rehydrate my dry yeast into starter wort. I know there was once a taboo against it, but one pack s-04 into 1L starter wort shaken as hard as possible takes only a few hours to reach high Krausen. I can get one going the very start of brew day and pitch the whole active starter by the end. I've had amazing results, and I've even sped up grain to glass timings quite a bit.
Sorry if this is a ramble, I've just got out of work and I'm enjoying a few pints of this style as I type this...errors may happen