tig penetration on al. question

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I can make fairly nice looking beads on aluminum but some times I don't get as much penetration as I would like ( after I break the cupons backward in the vice ! )  I am having some difficulty SEEING a difference in the puddle when I am making the weldbetween aboout 50% pen and like 75%-100% .     Is there as visible difference to be seendurring the weld or do you have to just make some test welds on the similar thickness scrap to figure out the proper current range ?Usualy I can see the toes not quite wetted in on a 50% pen but only after the weld is done.Can't see that durring weld ! What do yall do ?Tim
Reply:I am having some difficulty SEEING a difference in the puddle when I am making the weldbetween aboout 50% pen and like 75%-100% . Is there as visible difference to be seendurring the weld