CML/LVDS driver for several GHz, parasitic RC filter formed by terminating resistance and load capacitance
I only see a few dB of attenuation @ 3GHz, are you really sure this is a problem?

The line receivers are usually good for a few hundred mV differential, and I am seeing ~600mV there, so it is not like you are that short on level at the output end of the line. 

There is a reason line equalisation and preemphasis exists, but I would call 3pF awful high for this sort of thing, fractional pf is more like it. 

Note that the usual expectation is a transmission line pretty much right to the load, so where is your 3pf load? 

Narrowband you can do stub line or even an L match with lumped components, 2GHz is low enough that 0402 parts still look like lumped elements.