Correct way to rotate in NIXXES engine's quaternion system

gistfile1.txt

// uses the current quaternion used by the game to calculate the new quaternion by first creating a new quaternion from the angle delta's and multiplying it with the 
// current look quaternion like: angleQ * currentLookQ. This new quaternion is then used as the new game quaternion.
XMVECTOR Camera::CalculateLookQuaternion(XMVECTOR currentLookQ)
{
	// Game has Y into the screen. roll is therefore used for Y. pitch / yaw have to be negative due to the alignment of the axis vs what the user expects. 
	// Game will create tilt when rotated, as Y is into the screen.
	/*
	// WORKS, but creates massive tilt.
	XMVECTOR angleQ = XMQuaternionRotationRollPitchYaw(-m_pitchDelta, m_rollDelta, -m_yawDelta);
	XMVECTOR toReturn = XMQuaternionMultiply(angleQ, currentLookQ);
	*/ 

	// alternative method, separated calculations, no tilt. Trick is in swapping order of (xQ*currentQ) * zQ. Doing it as zQ* (xQ*currentQ) will introduce tilt. 
	XMVECTOR xQ = XMQuaternionRotationNormal(XMVectorSet(1.0f, 0.0f, 0.0f, 0.0f), -m_pitchDelta);
	XMVECTOR yQ = XMQuaternionRotationNormal(XMVectorSet(0.0f, 1.0f, 0.0f, 0.0f), m_rollDelta);
	XMVECTOR zQ = XMQuaternionRotationNormal(XMVectorSet(0.0f, 0.0f, 1.0f, 0.0f), -m_yawDelta);
	XMVECTOR tmpQ = XMQuaternionMultiply(xQ, currentLookQ);
	tmpQ = XMQuaternionMultiply(tmpQ, zQ);					
	XMVECTOR qToReturn = XMQuaternionMultiply(yQ, tmpQ);
	XMQuaternionNormalize(qToReturn);
	return qToReturn;
}