Wells, David: am I screwed?

My team plays in SAFECO. I picked up D. Wells to protect N. Robertson in the rotation, despite his obscene HRs vs LHBs.
I am trying to make sure he is not exposed to heavily left handed hitting teams.
My thought is this, most teams in my league feature no more than 3 lefties in the lineup vs LH starters. If Wells goes through the lineup about three times (5-6 IPs), that's 9 ABs by lefties. My math says every roll on his pitchers card has a 14% of an HR, including BP chances at 65% (SAFECO = 1-13 HRs). In other words, 7% HRs (50% of rolls land on the pitchers card) of 9 plate appearances by LHBs = .63 HRs per game. Keep in mind this is offset by:
1. "w" lefties only get a single.
2. Wells HRs vs RHBs are quite low, plus he is a 6R.
So far he has yet to impress with a great outing, and HAL seems to love getting him out of the game after 3 runs, even when "quick hook" is NOT checked. I'm going to try "slow hook" max 6 IP to see what happens.
Has anyone had sucess with D. Wells considering the price?
I am trying to make sure he is not exposed to heavily left handed hitting teams.
My thought is this, most teams in my league feature no more than 3 lefties in the lineup vs LH starters. If Wells goes through the lineup about three times (5-6 IPs), that's 9 ABs by lefties. My math says every roll on his pitchers card has a 14% of an HR, including BP chances at 65% (SAFECO = 1-13 HRs). In other words, 7% HRs (50% of rolls land on the pitchers card) of 9 plate appearances by LHBs = .63 HRs per game. Keep in mind this is offset by:
1. "w" lefties only get a single.
2. Wells HRs vs RHBs are quite low, plus he is a 6R.
So far he has yet to impress with a great outing, and HAL seems to love getting him out of the game after 3 runs, even when "quick hook" is NOT checked. I'm going to try "slow hook" max 6 IP to see what happens.
Has anyone had sucess with D. Wells considering the price?