First off, I would definitely go with Schaub for your bye-week QB. Tannehill is just way too much of a gamble as a rookie with a mish-mash WR corps led by Hartline and Bess. Schaub has numerous guys to target (AJ, Daniels, Foster+Tate out of the backfield), an he has led the NFL in passing before. Easy choice for me.
As for the pickup, I would drop Hardesty and stash Amendola, who is really valuable in PPR formats. Seems like another pretty obvious move, especially since you have 8 bench spots.
MounD - Double Threat FHL (18-19 champs)
10-Team Yahoo daily H2H Dynasty
3C, 3LW, 3RW, 6D, 2G, 7Bn (IR)
G, A, +/-, PPP, SHP, SOG, FW, HIT, BLK // W, Sv, GAA, Sv%, SHO
C: Bergeron, Barkov, Aho, Point, Kadri
LW: Marchand, Landeskog, Hertl, Marchessault
RW: Stamkos, Tarasenko, Laine, Palmieri
D: Carlson, Letang, Dumba, Weber, Pietrangelo, Ristolainen, Byfuglien*
G: Bobrovsky, Holtby, Lehner, Greiss-Varlamov
Farm: Turcotte, Cozens, Denisenko, Newhook // Sandin, Jokiharju, Dobson, K'Andre // Shesterkin