Lineset bending problem-suggestions
I have used bending springs over the years, you can buy them to fit all sizes of copper.
I have bent many 90 DEG soft copper bends with them.
What you can do is purchase the size you need, slide it over the tubing to the spot you want the bend and bend it then leave it on and insulate over it, it won't do any harm.
No ells, no torches, no contamination and no kinks. The cost of the spring might be worth it. I know it sounds unconventional leaving it on but it will work.
No Warranty Means- If it breaks in half you get to keep both halves.