Muto
(Muto)
10
On your A01, if you have not already, try throughly cleaning the head and battery tube.
The symptoms sound like bad connection, skipping modes, flickering and low output.
Rub battery tube end over newspaper.
Clean battery contact points in head with Qtip dipped in alcohol.
You are right about the output being no where near 100 lumens, between the floody reflector and the Nichia LED it is probably more like 60-70
But it is a nice beam 
HTH