I was told by ETI that a drop shank was not need if the bottom of the receiver box was 20" or below. ( I do have have the 2 5/8ths lift and the bottom of my receiver is 19 1/2")
Depends how much bottom range you have left on the shank.
IMO - Appears from your pics you need to lower your hitch head on the shank by about 5"
The 2 big bolts on the right of the pic below should do the trick:
Unhitch trailer. Loosen / remove the bolts then slide the hitch head down on the shank about 5". Careful - heavy.
Don't attempt if you are not comfortable / knowledgeable regarding such.
Hitch head may need angle (washer) adjustment afterwards as well