I've managed to get my hands on a Spectrum +3 from an old friend of mine (Just had to re-solder a dry joint on the audio/tape socket and it seems to be able to load stuff now). Currently, the +2A/+3 ULA timing settings used for my mame implementation are based on the results that the Fuse emulator gives. Now I have an actual +3 I can double check if my +2A/+3 settings are correct. Soon I'll create another photo album containing screenshots of the +3 running floatspy, btime, stime, ulatest3 (Like I did for my Spectrum 48K and +2)