well blue colourant makes for more elastic filament.
I have various coulour tpus and blue is hands down the floppiest.

Well the only bowden printer I still have is the delta.

On that i use 4.8mm retractions at 70mm/s

I also have options ticked to:
Avoid crossing gaps
retract while wiping
only retract when crossing open spaces.

Stringing is just not something I get with pla.

Here's the logic.

Plastics stretch, the hotter and more liquid a plastic is, the less likely it is to string with a fast retraction.
Cool pla will string like abastard, plus for decent layer adhesion 185 is also too cool.

I print at Actual 150mm/s and a 0.4mm nozzle and 210c with most pla.
For slower prints I'll drop it to 200c
But rarely go higher or lower.

Go too hot and you might get blobs if the plastic is too liquid.

The other thing that you will see on youtube is people saying to use travel speeds that are much faster than the print speed.

I tend to keep travel speeds pretty close to print speeds.
That said I tend to print at between 100-150mm/s anyway.

But I've found over the last 10 years that not having the print head constantly accelerating and decelerating not only gives much better looking prints with minimal blobs. But also gives the extruder time to finish the retraction before moving across gaps.

So maybe try that.

Alao buy a different brand pla and try that.
:-)