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,

Wrapped phase

Unwrapped phase

Elevation output from Phase to Elevation tool

Height output from Phase to Height tool