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LAUNCHXL-CC1352P: 12dB insertion loss just from adding another RF switch ?

Part Number: LAUNCHXL-CC1352P
Other Parts Discussed in Thread: CC1352P

Instead of using a capacitor stuffing option to switch between the internal PCB trace antenna and an external SMA antenna, I added a RF switch (Infineon BGSA12GN10) :

Here is the layout :

The problem is the output power is low by around 12dB at 915MHz :

I cut the traces going into and out of the RF switch U600 and soldered series 47pF capacitors on these cuts (this did not change the output power at all - still the same level).

Thoughts ?