My that is a big one you've got there!
The venturi should be fine on the tee'd off section as there is plenty of straight pipe before it for the liquid to settle down into a laminar flow. On my processor it is also teed off the main loop with a good run before it, and that pulled near perfect vacuum with water
The only thing I would say is that there is quite a height of liquid after the venturi, this back pressure may well kill the venturi's performance. It would benefit form being up higher, right before the discharge bend.
That has the additional benefit that if the pump stops during demething, the processor won't drain out of the venturi port (it's good practise to loop any pipes on the port side above liquid level anyway, just in case...)