Hello,
first thing I can tell you is you not use OB according to the Manual and Recommendations from Elektron.
The Buffer need to match DAW/OB so the value need to be the same 128-128 or 256-256
(buffer sample 128 in ableton - 256 in overbridge)
Other point is OB is 24/48 so you need to set Ableton on 16/48 or 24/48
(48 kHz, 24-bit D/A and A/D converters) Ableton is generally set to 16bits / 44100 if you compared A4 main outputs you need to set Ableton to 24bits / 48000hz
Next and Last :
the sound of each track sounds lacklustre compared to the sound that comes out the A4 outputs. eg. reverb does not sound as lush, delays are weaker and sound is less punchy/lesser quality than normal outputs.
Please at first compare The sum of Trk1 + Trk2 + Trk3 + Trk4 + A4 Effects through the A4 outputs and the same approach in the Overbridge Recordings with the Specifications I give you earlier. Otherwise, you can be fooled by not comparing real A/B (I mean same routing)
Also it’s a bad thing to not keep head room as you done by :
Track/patch/oscillator volumes are up max
Also if you compared the sound, you need tell us how you compared the sound (and compared each one to the same level in dB). Because there’s always converters in between, soundcard, monitoring, headphones… it can drastically change how you perceive the sound itself through this different device.