Understanding why I lose fish

[Nicodemus_Mercy]

i'm sorry if you are overmelded and hq and your gathering/perception is only that you've done something wrong. fully pentamelded crafted HQ gear i have 1177/1200 gathering/perception.

There is always a chance to lose fish. it's just simple rngesus.

Those stats sound like MIN/BOT stats not FSH stats. Not having an actual stat giving off-hand means fishers have about 200-ish less gathering and 350-ish less perception (plus materia) than Miners and Botanists which would seem to account your higher numbers. Fishers always have less gathering and perception than Miners and Botanists though fishing itself is balanced around that. But if you're really talking about your FSH stats I too would be curious to see how you managed that.

Just playing with Ariyala's gear calculator, it looks like the best stats a Fisher can have with pentalmelded hq gear, FC buffs, and food, is around 1030-ish gathering, 900-ish perception and 738 GP, which again falls in line with your stats minus a stat-granting off-hand. Here's a link for reference: http://ffxiv.ariyala.com/136SV