Yes, cleaning the intake and intercooler will help. As will removing the EGR valve and cleaning it too.
Make sure the crankcase pressure isn't high, the ALH engines have an oil control baffle in the valve cover, I don't think yours can be taken apart to be cleaned. Make sure you don't have any vacuum leaks, these will raise crankcase pressure since the vacuum pump discharges air into the valve cover area, increasing the rate of flow of air through the crankcase ventilation system.
You could insert a small brass tube into the vent hole that is weeping oil, venting it to a small catch container. Remember, it needs to be open to atmospheric pressure since that is what pushes the EGR open. Plug it and the EGR will not function.
2k Jetta manual. PP520s. Ventectomy, Panzer Plate, DT hitch, 16"s w/ 205 55s. Short shifter. Boost gauge with blue LED backlight, same intensity as dash. Blistein struts and shocks. 0.658:1 5th gear swap and LOVING IT.