Gimbal lock causing smooth rotational issues

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Also interesting to note…that I got it working, but decided to figure out what I had originally done wrong and broke it again. After some tweaking, I turned off UseControllerRotationYaw and set the player controller camera manager to view pitch, roll, and yaw all from 0 - 360. All this while using this code using quaternions:

void ACodeOrvoCharacter::handleRotation()
{
	float TargetPitch = 0.0f;
	switch (gstate)
	{
	case EGravityState::GS_NORTH:
		break;
	case EGravityState::GS_EAST:
		TargetPitch = -90.0f;
		break;
	case EGravityState::GS_WEST:
		TargetPitch = 90.0f;
		break;
	case EGravityState::GS_SOUTH:
		TargetPitch = 180.0f;
		break;
	}
	FRotator CurrentRot = GetActorRotation();
	CurrentRot.Roll = 0.0f;
	FRotator TargetRot(TargetPitch, CurrentRot.Yaw, CurrentRot.Roll);
	FQuat desired = FQuat::Slerp(CurrentRot.Quaternion(), TargetRot.Quaternion(), .25f);
	//CurrentRot = FMath::Lerp(CurrentRot, TargetRot, .25f);
	this->SetActorRotation(desired);
}

and it worked. My dumb self wanted to see if quaternions were truly necessary so I uncommented the Lerp and changed code accordingly, now I can no longer reproduce the working project.