Coolant leak- accumulation on supercharger

R53- ( supercharged 6-spd manual)

Looking for ideas on what might cause a coolant leak yielding accumulation on top of supercharger and around upper air duct that might not be related to the head gasket. Coolant tank has obvious signs of loss from venting through valve (not the OEM tank.) Upper rad hoses quickly warm to touch, no leaks. Radiator fan shroud is dry. Leak is limited to passenger side, not water pump. Fluid runs straight down onto alternator, steady drip at floor, tank loss approximately half, fluid viscosity good, minimal discoloration likely from residual rust.

Vehicle History:
A head gasket repair was preformed by some mechanics approximately four years, 50,000 miles ago after significant emulsification found in coolant reservoir. They put the car back together wrong and did some damage to the vehicle, so I have little faith in the work. Since then I have done all work myself, everything has been torqued properly. All repair listed below has been done in the past three years, 30,000 miles. Much of the work was done with in the past five months, 3,000 miles. I drove highway- 1,000 mile moving and then daily driver for the past month. No leaks or other cooling concerns. To my knowledge the car has never overheated. I've owned since 40,000 miles. I still have no obvious oil leaks, blow by or evap oil loss. All repairs have been done using OE parts except for those specified below and some Victor Reinz gaskets. Potential effecting things I have replaced:

- Engine oil cooler- with corresponding hoses and gaskets
- Upper and lower radiator hoses
- Coolant expansion tank- canton aluminum, 30psi cap
- Thermostat and gasket (x2)
- Thermostat housing
- Cooling system flushed x4
- Valve cover gasket
- Inter-cooler- forge
- Inter-cooler bellows
- Inter-cooler bellow clamps
- Oil pan gasket
- Oil filter housing
- Engine oil cooler
- Cooling fan
- Radiator- csf
- Radiator fan, shroud and relay
- Ran relay 2
- Crank sensor o-ring
- Heater core
- Temperature sensor
- Supercharger oil
- Cold air intake with clamps- m7
- Intake manifold gasket
- All gaskets through air ducts, supercharger, manifold etc. Pathway
- Water pump
- Water pump hose
- Water pump flange, gasket and o-ring
- Air duct bi- valve hose and clamps
- Bypass valve o-ring
- PCV
- Throttle valve o-ring
- A few other coolant hoses and plastic junctions including lower hose at firewall

The only true performance change I have made is a 15% underdrive pulley but I did swap spark plugs- NGK (dropped one heat cycle to jcw's), NGK spark plug wires and JCW drive belt.