First step will be getting a little more RB depth. Some of the guys still available are Starks, PT, DAW, Michael Bush, Donald Brown, Mendy. So I'll drop Bryant for another RB. I'll probably swap Baldwin out for another WR that I like more. Not sure I want to cut my second TE. I don't usually carry two of them in this type of league but Tamme could really surprise. I can drop Dalton to free up another spot for a RB or WR.
I agree with your assessments of your team. Without knowing the top WRs available, the two moves I'd make right now are dropping Bryant and Doug Baldwin for Starks and Donald Brown. Dropping a backup Kicker and a WR you will hopefully never have to start for 2 more starting RB's in June is the way to go. You can always get a WR of Baldwin's preseason caliber on the waiver wire, and package the RBs for Wrs, later. You have a lot of time to tinker, and although RBs are becoming devalued in drafts, there's no reason not to hoard and deal.
I also agree with holding onto Tamme. Unless, of course, the Peyton hype becomes too much to manage, and you get to sell high on him. By sell high, I am basically saying move him for Witten's value (or move Witten, if that asking price is met).
I agree with dropping Bryant for Donald Brown. I'm not high on Starks, since the Packers don't run enough, and I have a feeling that there are a few backs in GB who will be sharing the carries this year.
I'm on the fence with Baldwin, as I think he could be a bit of a steal. He should have better QB play, regardless of its whether Flynn plays, Wilson takes over, or Jackson steps up and wins the QB competition. He could also have a breakout year. Even though most WRs reach their potential in their 3rd year, 2nd year breakouts seem to be more common in recent years. It really depends on who is left on the WW. If you post some of the top WR FAs, perhaps you can get some more feedback on this matter.
As for Tamme, I'd hang onto him through TC, and see if he sticks. Peyton loves his TEs, and he has rapport with Tamme, so he could have a lot of potential. He and Dreesen are both likely to make the team after the Seahawks committed $3.5M to each, but with Tamme's connection to Manning, he's far more likely to be the outlet that Peyton trusts.