Increase BOUNCE on a RigidBody (deprecated method -SOLVED)

Hello. I am building a pinball-style demo, using RigidBody2d for the ball and KinematicBody2Ds for the flippers. So far the response on contact is great but I am trying to make it to where the RigidBody's velocity increases after each flipper contact (provided it is in "_isForce" state). I saw set_bounce as a method and while it does what I need to, it is deprecated in the upcoming versions and I need to know the right way to do it. All help appreciated.

The _isForce variable on the flippers only triggers for a brief while after input. It is working fine so no need for it here. Also: the collisions count is just for debugging so I can make sure things are hitting right. My pinball is reporting collisions, but only one at a time.

BALL code

extends RigidBody2D

var _collisions = 0
var _bounceForce = 0.05
var _forceMultiplier = 1.5



func _on_Pinball_body_entered(body):
	if body.name == "LeftFlipper" or body.name == "RightFlipper":
		if body._isForce:
			_bounceForce = _bounceForce*_forceMultiplier
			_collisions = _collisions+1
			set_bounce(_bounceForce*_forceMultiplier)


func _bounceForceFixer():
	if _bounceForce < 0:
		_bounceForce = 0
	elif _bounceForce > 1:
		_bounceForce = 1


func _process(_delta):
	_bounceForceFixer()