I would consider parking your car at EPCOT that morning and then taking a boat of to DHS. Now after F! you can just hop a boat back to EPCOT and be in the WS with plenty of time to spare. This might be much easier than after F!, getting to your car, maybe fight a little to get out, drive to EPCOT, find parking, walk all through FW just to get to the WS whole half the time worrying if you will make it in time.
In either case you should make it in plenty of time. It really depends on which would bother you less, the stress of getting there in time and driving from DHS to EPCOT or parking in EPCOT in the AM.