Donnie to Edd (depends on what you like but Edd is more stable and you have no other SOB)
Skrumxxt to Eris (Eris is much more stable in damage)
Na Boh to Wakai/Nimestiec (although this is more about player style so you can keep him if you want)
Trinmkkt to Petra (I highly recommend this switch because Petra is a staple and has the much needed SOB as well)
Na Boh to Nimestiec - you at least stand a chance of winning if you drew Nimestiec solo. Na Boh in a solo hand is pretty much a throw away card.
SkrumxxT to Stella - IMO, Stella is the best 5* card in the Sakrohm currently (with the exception of Guru Cr, of course). SkrumxxT is too unstable, SOA just murders the dude outright.
On weeks where Uranus is banned (and that happens too often for comfort), you might consider pushing for Murray, Sigma or Ngrath.
Definitely TrinmkkT to Petra.
You might want to consider bringing down Donnie to a 3*, maybe Sharon, Ottavia or Milovan (hey, don't knock it, he's one of my favorites), then promoting Prince Jr to another 3* card. This is personal preference but that's way too many 2* cards for comfort. Prince Jr/Spiaghi/Mona/Nimestiec = 10 damage total. You can't even KO a guy by winning all four rounds - and you're not gonna win all four rounds.