I’d go easy when doing this .. but it’s the bracket itself taking the strain...
You don’t want the bumper too close to body, as shown in photo, as a possible side impact will mean certain fiberglass damage…..
Also, those bumper sides come in fairly easy when tightening the side bolts… just go slowly… Trying to straighten the bumper off the car can be done, however that’s unfortunately a good way to crack the chrome plate.