Agree with
@Pericles the Lion , and right - your 180 ARC causes the "effect". I have one too, and here's why:
@Red 2615 - This is going to sound strange, but when you get a 180 ARC, you stop getting 5 and 2 packs from investment returns. It’s called the “rule of 5” mathematically. SO 99.9999% of my bank is made from investment returns, and once in a while I’ll get a 5 pack from my Chateau, but NEVER any 2 packs.
So when I need 2 FP for something, I have to have 2 FP in my well, or if not, it will break a 10 pack, leaving 8 in my well. It’s very time constricting, because I lose the normal 10 hours for the well to fill, I have reduced it by that 8, to only 2 hours.
So I crack 10 packs all the time. I sometimes study the last digit of my computed investment to see if I am going to leave myself with a full well, or it fits mathematically firm (nicely) into a slot I’m loading.
I usually round up the investment to make the well be 0, or sometimes I’ll go 1 short on the investment, and run out to the city and buy 1 FP for coins, and return to make the investment perfect to the math, so I don’t have to crack a 10 pack and leave 9 in the well.
It’s not a problem you’ll ever seriously have until - you get to 180, as you know
So simply - in FoE,
all GBs have either a 5 or a 0 as the last digit of the base FP value for ANY of the 5 reward slots.
A 180 ARC delivers a 2x multiple. So … if it’s a 0, it stays a 0. If it’s a 5, 5 x 2 is 10 (so I get a 10 pack).
As you can simply see , the math rule of 5 insists that all I (we) can get are 10 packs - There can be no 5 or 2 packs.