I have done my fair number of these two SO flights. I have not submitted an ASR-F. Three crew AUS flights are far far more fatiguing than these 2 x SO flights. I have not taken controlled rest on them but have many times on 3 crew flights (yes ASR-F submitted). I think the main reason FOs are not submitting the forms is because, they are not that bad...... It devalues the ASR-F system in my opinion if used as a weapon.