Including yesterdays clunker, Delcarmen has a 2.82ERA and 1.12WHIP since the start of May. He has been just fine.
As far as Hansen, he's actually been very good with the game on the line, but horrible in mop-up duty. Small sample sizes all around, but in a tie game batters have a .077BA and .451OPS off Hansen, and in a 1 run game they have a .231BA and .619OPS. But when the lead or deficit is 4 runs or more, batters have a .353BA and 1.110OPS off him. In high leverage situations (according to WPA) batters have a .143BA and .429OPS off Hansen, and in low leverage situations batters have a .263BA and .811OPS.
Amazingly enough, the more pressure he's in, the better he's performed.