Phase to elevation improvements

Hello all,
I have an unwrapped interferogram made from Palsar-1 data that I want to convert to elevation. When I run the phase to elevation tool I get an output that looks ramped (using bicubic interpolation and SRTM sec1). However when I run the phase to height tool I get more of an output that’d I expect (except it is in radar coordinates and not elevation). I’ve tried multiple reference DEMs and resampling methods, is there any way to improve this process? Is there a way to convert height to elevation?

Any advice is appreciated.
Thank you,
Andrew

Wrapped phase

Unwrapped phase

Elevation output from Phase to Elevation tool

Height output from Phase to Height tool