I have Rossini + clock + 282 + HiCap + 300 + 300 ps unfortunately my rack is freakishly tall and I’m concerned about the center of gravity give Rossini is pretty heavy.
Partly it’s due to easy access and partly to separate power supplies from sources and preamps.
With restrictions your current set up looks about right but if you wanted to try a change I would suggest
282
300
Bartok
Hicap
300ps
When you fancy an upgrade try two racks. You are probably already aware that changing the Hicap for a Supercap will be a good step up but it then wouldn’t cost much more to move from a 282 to 252.
I’ll leave it to someone else to point out a preowned 552 is also not much more than a 252/Supercap.
You have a great source and a better preamp would be very worthwhile. Probably just my opinion, and one you’ve not asked for, but try for yourself if you can demo.