I've caved for a number of years and have been quite at home using the Petzl Super Avanti sit harness which has been fine for getting me up and down most piches. However, in the last couple of years [I've grown older and middle age spread has altered my body shape a bit!] I've noticed that on ascending pitches I tend to be pushed back away from the rope which results in me using my arms to pull myself up on my Petzl ascender more than I should be doing resulting in me getting tired. I am also losing efficiency as my legs are not kicking downwards when ascending. I use a Petzl torse chest harness to keep me close to the rope. Are there better harnesses than the Avanti that will help keep me in an upright position when ascending the rope? Would the Fractio provide better support or should I consider switching to the AV Technibat? I'd welcome advice on kit or ways I can improve my technique...