Frustrated with WBT upgrade : need advice

Hi
I just replaced WBT Midline binding posts($40/pair) on my speakers with WBT Signature ones ($124/pair) and also WBT Midline female rcas on my Pass X 250,5 with WBT Nextgens and the sound went from very good to bad.The soundstage narrowed and the sound became bass heavy and zippy,almost harsh.Binding posts were crimped on the same sleeves i had with Midlines and Nextgens were soldered with WBT silver solder.I would like to gather the opinions of those who had experience with WBT Signature posts and Nextgens.Is it just a normal break in process and how long will it take to be completed?Or maybe it is that Signature posts have a very distinct sound and i have a mismatch on my hands?When i upgraded the stock Edison Price posts on my speakers with WBT Midline,the sound was amazingly good right away.Please,share your opinions on above mentioned connectors,i will really appreciate that.Thank You.