Okay so I'm fairly new to mig welding aluminium.. Actually welding aluminium period.. And I am having a couple issues.. I got a HH140. And I don't have a spool gun.. The wire is feeding fine through the lead.. My main problem is. While the bead itself looks okay from the top. Its got bad undercut on the sides.. I've tried lowering voltage. Raising voltage. Adjusting wire speed. Giving more stickout. And I can't get it to do right.. Anyone know what might be the problem?