Running Alu pushpull with a Trailblazer 55, Slope settings?

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Hi, I lurk here a bit and did a bit of searching but im looking for a rough guess on slope setting. I usualy run my cobramatic 3A off my Big 40, CV, Remote contactor, panel V control.  The TB55  has Minimum, Medium and Max on the slope and 4 voltage ranges, 18-25, 21-35, 26-42- 34-55. This would be much easier if my Big 40 had A/V gagues, but it does not. anyways the material to be welded is 6061 1/4" channel to 5/16" plate the filler will be 5043 or 6061 .045Any V/A suggestions would be appreciated, I rarley setup to do alu mig, mostly tig it, this project doesnt have to be pretty and theres about 1200-1500' of weld gut feeling that would be a long ride with gtaw. Reason im not using the big 40 is its on another job doing tig ss.Miller Big 40GMiller HF-251 D High FreqVictor OA Lincoln 135 MigMK 3A CobramaticBridgeport J HeadCronatron OxylanceRadnor ACAG TorchWeldcraft TIG Torches1 blown knee and two 5 Gallon pails away from being a hero.
Reply:Im figuring i m gonna run 250 ish on the amps about 26-29 voltage and about 380-400on wire speed and the wire is gonna be 5356 or 6060 I had a few in me when i posted the 5043 i dunno if it exists the other evening Miller Big 40GMiller HF-251 D High FreqVictor OA Lincoln 135 MigMK 3A CobramaticBridgeport J HeadCronatron OxylanceRadnor ACAG TorchWeldcraft TIG Torches1 blown knee and two 5 Gallon pails away from being a hero.
Reply:I read that 5043 from the op and was scratching my head.Miller Pro 30068 SA 20064 SAF 300305 G Lincoln gasserMiller 210