Is it the lack of the harness?
Is it the amount of wind drift the 8 grain(or lighter) pellets get at longer distances?
a combo of both?
I know you have a jacket but give us your opinion on what poses the largest challenge for you moving to WFTF from Open?
I am curious since you are VERY qualified to answer this since you have been such a great shooter for a long time and your opinion is valued in this community.