Welding Tips and Tricks

I recently switched from 75/25 to 85/15 AR/Co2 for solid wire steel MIG. I made the switch in order to be able to use both short circuit and spray transfer modes. I am using .035 ER70S6. It sprays pretty good, but when I am using short circuit transfer I can't seem to find a nice "sweet spot". When I am welding in short circuit I can never get that soft crisp buzz or a smooth arc, but when I finish and lift my hood it looks like a decent weld. Is this just the nature of c15 or am I not finding the correct settings? I realize that with less Co2 I will require more voltage in short arc. I have come to the conclusion that I need to bump it up about 1 to 1.5v from the 75/25 voltage that I like. I have scoured the Internet for information particularly a WFS/voltage chart for 85/15 MIG and cannot find anything. This would make for a great video Jody if you are reading this, to compare different MIG gas blends and their effects on penetration and voltage requirements.
Thanks for any help,
Alex

I've never bothered experimenting with Ar/CO2 mixes.

I wish I'd had the opportunity.

Generally, I've used 75/25, or tri-mix.

I have unlimited access to helium, so if I have to spray it...

Someone will comment on your question shortly, I'm sure.

Steve S