I too did the same in some mocks and I actually like it. Trading back twice to recoup an additional 3rd and 4th round pick would be wise for them. I was able to trade down in my best mock 2 times to the 20th pick overall. It added an additional 3rd and 4th round pick in both trades. I was still able to draft:
One of WR - Burden, Egbuka
One of RB - Henderson, Judkins, Johnson
Those should be the top two picks anyhow. Offence is the way to go. Instantly makes the team better and harder to stop. With your 3rd and 4th round selections you go after DL and CB.