Playoff Advice needed

Hi Guru-

This is my first playoff week and I need your expert advice.

1.)  I'm wandering should I replace Lawrence Timmons with one of the following:  Brian Urlacher @ Vikings, David Hawthorne vs. Falcons, Jon Beason vs. Cardinals, London Fletcher @ Cowboys, Desmond Bishop @ Patriots, or Curtis Lofton @ Seahawks?

Timmons is home against the Jets this week.

2.)  Do you recommend replacing any of my DLs (Jared Allen and N. Suh) with one of the following:  Kyle Williams @ Dolphins, H. Ngata vs. NO, Clemons vs. Falcons, Pouha @ Steelers, Seymour vs. Broncos, J. Abraham @ Seahawks, or Idonije @ Vikings?  If so, who?

3.)  I have B. Pollard and T.J. Ward for my DBs.  Do you recommend replacing any of them with one of the following:  Michael Griffin vs. Houston, Q. Mikell @ Giants, D. Landry vs. Saints, Abram Elam @ Bengals, Richard Marshall vs. Cardinals, Polamalu vs. Jets, or Craig Dahl vs. KC?

I am in a tackle heavy league.  Scoring system:  Solo tackle - 1pt; Assist Tackle - 0.5pt; Sacks - 2pt

Thanks in advance,

T. Watts

1) Yes, I would replace Timmons. I would go after Hawthorne than Urlacher than Bishop
2) Keep Allen and Suh. If the SS wasn't so tackle-heavy, I would recommend dropping Suh and picking up John Abraham.
3) Keep DBs