Thank you GM Emdub
I will fill out the form later on but in the meantime:
Koghatu seemed immune to 1000 needles at one time. This is pointless now since the BLU spells have been changed but it was the first instance where I had issues. Changing to magical accuracy atma, using acetic's tonic, Apollo's staff, and magic accuracy gear didn't help either (at suggestion of party members).
Amhuluk Earth Threnody (Wind based) BRD90 capped wind skill (can supply numbers), capped singing skill (can supply numbers) , sub job was BLM and elemental seal didn't help. Also, elemental seal didn't help when stacked with acetic's tonic, and Soul Voice (BRD 2HR.) -->> Also it was wind day of the week; it should've had some boost on wind magical accuracy (no I wasn't using Furin Obi on BRD) but maybe it boosted the DEF of a the wind-based NM anyway...?
Gamayun immunity to Flash? Didn't land the spell once but this is probably related to having a low divine skill on WHM. (Divine @ 316 uncapped - whm90/sch45)
I've heard other people complaining about these also, but in the case of Koghatu at the time I humbly asked the person who kept saying "Not enough magic accuracy" to switch to their BLU and try it. They couldn't land the spell either. I know there are another 1-2 that have had problems but I didn't pay much attention them them at the time it happened. If I find more I'll update...
If it is true that some spells are "impossible to land on some days" then so be it. I encourage more people to reply with their testimonials but this was to inform in case some things weren't working as intended. Oh, and POIDH.