Its a multi-way pot I tend to lead out if its multiway and just hope someone or more then one has an over pair in this situation or just make the call with two over cards.
On the turn I would def bet bigger like 2/3 pot as any A will make the call and so might any flush-draw and even a middling pair might make the call. Making it twice as big means that you only need halve the calls and have a bigger pot.
They all called now the pot is still multiway and it will be hard to extract value as in a multiway pot no one will believe that you are double barrel bluffing. As any bet will look strong (a good A or better for value) would try to get the max from an Ax type of hand so 2/3 pot to an over bet depending on what people tend to do on the level I am playing. But I would def not bet less then 2/3 pot.
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