I think it's very difficult to say how much you should bet in any situation because there can be many different variables. I like to try and do the same thing so that no variances show up. For example if I decide to bet on the flop generally I will bet the pot (hey "bet the pot" now thats a good name for a poker forum). That way nobody can pick up on different amounts that you may bet.
I notice you put losing too much down to "too many all ins". I believe in a S&G, certainly early on, you should be avoiding going all in. Especially if somebody else is putting you all in. I think you need to be careful of hands that will clearly make you a second best hand, eg kj, qj, aj etc Obviously once the blinds have increased to a decent amount (about level 4 on PP), you will find that you will be going all in more if you are on a shortish stack to pick up pots.
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