Since you are using Kimber Monocles and the Stirling LS3/5a's have separate bass and mid speaker terminals, what are you using for jumpers?
You have a lot of good going in your system as is. One could argue to go further up the turntable/tonearm chain, but the only weak points I see at present are the interconnects and possibly the jumpers to the treble inputs on the speakers. I have bi-wirable speakers too, and for a long time I bi-wired them, but when I upgraded to a much better single run cable (Zu Audio Libtec, now discontinued), I had to experiment with a wide range of jumpers until I finally hit gold with a matching set of Zu Ibis jumpers. Because jumpers are so short, a fresh set only takes about 15 minutes to burn in, and I found there to be very noticeable differences in midrange and treble quality. By the same token, regardless of Blue Jeans claims, you aren't going to really know what your LP front end is dishing out through a $34 pair of interconnects.
Your quest for more upper octave smoothness and midrange transparency--given the quality of your system overall--indicates a need for better cabling. Check into a pair of Kimber Heroes at least, and a pair of Kimber Select speaker jumpers to match the resolution and quality of your Monocles.
You have a lot of good going in your system as is. One could argue to go further up the turntable/tonearm chain, but the only weak points I see at present are the interconnects and possibly the jumpers to the treble inputs on the speakers. I have bi-wirable speakers too, and for a long time I bi-wired them, but when I upgraded to a much better single run cable (Zu Audio Libtec, now discontinued), I had to experiment with a wide range of jumpers until I finally hit gold with a matching set of Zu Ibis jumpers. Because jumpers are so short, a fresh set only takes about 15 minutes to burn in, and I found there to be very noticeable differences in midrange and treble quality. By the same token, regardless of Blue Jeans claims, you aren't going to really know what your LP front end is dishing out through a $34 pair of interconnects.
Your quest for more upper octave smoothness and midrange transparency--given the quality of your system overall--indicates a need for better cabling. Check into a pair of Kimber Heroes at least, and a pair of Kimber Select speaker jumpers to match the resolution and quality of your Monocles.