Grabbows are known for being immensely fast (at least among unupped decks) and highly customize-able. If you have seen a common weakness among the group of decks you plan to fight against, modify it around and pack some counters. I suppose this is for arena bronze/silver? Flayers are better CC if you have diverse defense options in the deck, removing skills is very good for the long fights.
If you are having trouble with immorushes, pack some continuous CC like otys (I know I am out of my mind) or warden with buffs. Alternatively, subbing in a heal might also do, as extra hp is vital in the phase of exchanging blows between 2 rushes. If none of the above makes sense to you, just use more lightnings/freezes/shockwaves, however, they are not guaranteed to work once the golem has out-grown the CC range. (Ideally maxwell's is the solution but the deck has no quanta for it.) Gravity Pull slows you down but is a guaranteed kill.
Oh, and, by the way, sometimes, discord work with these decks. Especially when you are using SoFo. Yup, like many of you here, I yelled at my RL friends "arsenic is better in grabbows" but they won't listen. It turns out that they got tons of goodies from bronze with the mod though... I dunno.