For pulls I use left hand over and right hand under. I notice the bar slips away on the over hand (left) when I'm pulling at 90%+ effort. I want to see what's a good approach to this other than farmers walk with DB's and pulling using double over-hand as I have consider those two lifts. I only use straps on chin-ups/lat pull downs and that is just sometimes. I do use chalk. I do DB hammer curls for biceps on a weekly basis.