Don't make me say it buddy.
even if I tighten my nuts
Looks good! However, the problem I've had with plastic pegs is that they just don't grip to the dropout well, so even if I tighten my nuts down fully... after a little while the rear wheel slips in the dropouts.I don't run tensioners.. hmm, unless these pegs are 'different' in some way?
I have also had that problem. I find that they loosen reasonably quickly.Front and back. Wouldnt be too hard to stop the pegs turning, just an idea.