Suggest a pedal/effect for the last spot on my board

[Mayborns]

I always feel I am in the same situation you are in. I have a spot on my board and it plays on my completionism. I have had success with the EQD Hummingbird in the past for a trem, though I moved to the Jam Harmonious Monk, I like how it can mix the clean back in.

 

[AudioSlave556]

a tube preamp or an paraeq/filter pedal.
-tube preamps are a personal choice but im currently using a shift line olympic. runs on DC but at 12 v at 600ma but comes with a fx loop if i want to add in wet fx as well.
-paraeq+filter for final tone shaping like the empress bass para deluxe or sine effects mega para dx. lots of things you could do with it.
-hpf+lpf before the drives really cleans up a lot of unwanted noise and makes them more useable. an eq before drives can also help you shape your drive tone as well.