Firstly could you provide somedetails of the speed of signals and rise times of same on your PCB.
As far as I am aware hyperlynxis for high speed signal integrity, if you dont have a return plane the software cannot calculate the impedances and thus cannot realy calculate do the field solver calculations.
the mentor hyperlynx software always assume a complete plane for the calculations ( at least 3 times the trace width ). in your stackup you don have any. so all the calculations are made for traces crossing a large plane discontinuity. you may want to use a different simulation tool, if there are no planes at all.
here is a free one : Quite Universal Circuit Simulator
oscillator is generally used for clock signals. use the frequency of your clock on board.
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