Put together a little spreadsheet for data on leagues that score negative points for yards and points allowed as well as standard D/ST scoring. Took the bottom 3rd offenses in each category and came up with the optimal teams you want to play your D/St against in these formats.
The following offenses were bottom 1/3 in both scoring and yards per game. I'm going to make it a point to try and play D's against these teams in those formats.
Jacksonville
St. Louis
Kansas City
Seattle
Indianapolis
Cleveland
Minnesota
Denver
Miami
San Fransisco
Cincinnati
ETA: More crappy Offenses
Denver I missed before they're solidly in the bottom 3rd tier for both categories, Cincinnati is 7 ypg from being bottom 3rd for both (Giants vs Seattle and Cincy @ Thunderstorm should change that for next week). Also adding in Miami (No Henne, been trending downward since initial yardage explosion Week 1 vs NE) and San Fransisco (two late Ted Ginn returns from being bottom 5 in yards, bottom 10 in points).
In order of preference, as of week 4. I'm ignoring match ups where the DST is rostered in deep leagues.
Week 5: Indy VS KC, Cincy @ Jax, KC @ Indy, AZ @ Minnesota (NYG VS Seattle is the play here if available, SD @ Denver looks good too if they hit your WW, as well as Tampa @ SF)
Week 6: Cincy VS Indy, Oak VS Cleveland, Indy @ Cincy for desperate streamers too(GB VS Rams, Pitt VS Jax, Chicago VS Minny are all stellar matchups but probably not available)
Week 7: Oak Vs KC, Cleveland Vs Seattle, Seattle @ Cleveland, Miami Vs Denver, both for deep looks (Prime matchups include NO VS Indy, Dallas Vs Rams, Baltimore @ Jax, GB @ Minny)
So if you want to jump the gun on your league, grab Oakland this week, sit them against Houston and then enjoy a couple tasty match ups. I'll analyze the rest of the match ups as I have time if anybody cares.