I don't like how far forward such a set-up places the pannier weight. An under handlebar bag in conjunction with a mini front rack and top of bar bag could carry substantial gear located on the steering axis while eliminating a few lbs of racks and panniers.

https://www.revelatedesigns.com/inde...3&ProductID=25

http://www.jandd.com/detail.asp?PRODUCT_ID=FMBHP