[spaghetti]

My 3 cents:
-First: a 130 is very long and difficult to handle, especially if it's your first speargun. I guess many issues come from the long length. It's very hard to track/swing a 130. Best technique is DON'T do any side swinging at all: best way to aim such a long gun is to bend your arm backwards, redirect and then straighten your arm forward to the target.
-it's very difficult to hunt fish when in schools/groups, because schools always have a sort of sentinel alarm system: if you scare one, you scare them all. Once they get nervous, they start swimming faster and you will certainly get jammed by all those fishes and you will loose precious time trying to make a decision on WHICH ONE to shoot among the lot. So the best thing, even if they are dozens, is to focus on ONE single fish, track him calmly until he comes at range, and never change target, unless your first target fish disappears.
Have three extra tips:
1)NEVER target the first one of the row.
2)If the fish come towards you frontally, don't wait for him to turn on a side, but shoot him straight to his face.
3)close target: aim to the gill plate. distant target: aim to his lips and one inch above his head.
Enjoy.