Yes diffs can make a big difference.
Tighter diff less turn but more drive, losser diff more turn but less drive. With 4wd you have two diffs so you can blance under and over-steer on coast into corners and the same on throttle out of corners.
You obviously don't want to run the diffs so loose that they constantly slip, you wont get much drive and they will wear quick and you will flatten the balls. If they are too tight you will get more drive but can wear a groove in the plates quickly, its a fine balance. A 1/4 or 1/2 turn in either direction, once you get it it can make the car hit the sweet spot, along with all the other set up options you can do.
If your running a powerfull motor i would run the diffs quite tight as this keeps the car more stable, loose diffs with too much power causes more torque steer (car pulls to one side under hard acceleration). Do a few hard starts and set your slipper to slip enough to ease the drive train but not to much that it slips and becomes inefficient, too tight and the diffs instead of the slipper could slip and wear. A diff slip is less of a nice smooth whine than what the slipper makes, more of a cry.
Hope this helps
Later
VV
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