Mig wire size for Quadralink install

[nkopper]

Just got a Quadralink yesterday and hope to weld it in myself. I've been practicing my welding a lot, but having some trouble getting sufficient penetration on 1/8" or 10 guage material. The welder is a Millermatic 135 and I'm currently using L-56 0.024 wire (I know, not recommended for material thicker than 18 guage) and 75/25 shielding gas. So, the question is, what is the best wire size for this install, 0.030 or 0.035? The LWS has Inweld wire, looking at ER70 S-6 spec in either size. They said either would work, it's just up to my preference and welding style (whatever that is). Both are listed as acceptable in the manual for my welder, but opinions from some experienced welders is much appreciated. I've never used anything larger than 0.024.



Thank you,
Nathan