This is sort of common on touring cars with spools in the front. Although on my T2'007 I never had a severe vibration problem.
My knee jerk instinct says you need ECS style driveshafts (because they will not vibrate at full lock), but if the vibration is bad then there might be something else. Check the shafts first for wear or stuck joints. Check the bearings. Check the knuckles and c-hubs for cracks. If you're using 52mm driveshafts with a very narrow front track width that could maybe cause an issue with the dog bone ends bottoming out in the spool.
You can also reduce the amount of ackermann your setup has, so the inside tire at full lock will have less angle.