I have the Novara round town Panniers from REI. 55 bucks for two. they fold up and down ...I have a slightly smaller bike than you (55) and I don't get heel strike... I just position the panniers so they are as far back as they can go on the rack.
__________________
"Think of bicycles as rideable art that can just about save the world". ~Grant Petersen
Cyclists fare best when they recognize that there are times when acting vehicularly is not the best practice, and are flexible enough to do what is necessary as the situation warrants.--Me