Where along the tongue did you put the jack, so that you experience the twisting? Move it as close to the coupler as possible, and this should virtually eliminate any twisting.
I had my tongue jack on the stock HF trailer tongue for over 2,000 miles, and it held up well.
Here's where my tongue jack was....
Recently though, I did extend my tongue using 2x2 tube steel, and relocated the tongue jack. $32 worth of steel, $20 for a new coupler (or you can shim the original), plus the bolts and paint.
(Not quite finished painting in this pic)