Start low on wattage and slowly work you're way up til you get a vape you like. I'd start about 6.5 or 7 watts then go up. If you go too high, you'll get a dry or burnt tasting hit so go back down. The Protanks will not handle the power the Sig 30 is capable of. They likely won't even handle 10 watts.
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Protank 3's will handle 10 watts, wife normally runs hers at 11 on her MVP and if she borrows one of my mods will run them at 15.
When I was using Aerotanks and Protanks I normally ran them 9.5 to 11 and chainvaped with them all day long.
@Corona, when I first started using Protanks I found 7.5 to be a good starting point coming off of cigalikes and then gradually worked my way up to 9 -> 11 to the 12.5-17 that I'm currently using with my Kayfuns.
As
@UncleRJ said, finding the best taste for your juice is the most important thing, but you will also notice the heat of the vapor is different than the heat from either a cigalike or cigarette and that will affect how quickly you ramp up on the watts as well.