Stat Stick

I got chascas bow trying to get linneas weapon (which i got later) but I was wondering if its a good stat stick for fischl? At the moment i have no charged attack dps except tignari (but i dont use him). The weapon is sitting in my inventory and fischl currently has r5 stringless. Is it worth giving her chascas bow for the 608 base atk and 66% crit dmg?