I will second what the others have said about the back guide roller/block letting the blade ride too far up. Check it out.
As for your cutting tubing. I have found some batches of square tubing that are hardened at the joint seam. The rest of the tube will cut fine but the welded joint is heat hardened. It will ruin a band saw blade, even the good bi-metal ones. When I cut tubing on a band saw now I take my torch heat it red hot right at the weld seam. Just let it air cool and it seems to take the hardness out of it.. It has made my band saw blades last much longer.
I found a used Milwaukee metal saw last year. The blades are high ( $50 each) but it is the best thing for tubing and pipe I have ever used. It is fast and will last a long time if you don't let the blade bind.
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