21 HC 3.0 duramax

I think this may be first time post in a while . I have 2021 silverado High country 3.0 duramax. Currently running RC 3.5 lift with Vertex shocks all the around. . Looking to maintain 3.5 inch lift with DssV shock upgrade. RC a vertex seemed good at first. But after 140k miles on them I think they are getting tired. Also not to mention the bolts holding the RH side coilover failed and left me stranded and tore my cv shaft. (Working with Rough Country to resolve that issue. ) so at this point replacing shocks with DSSV from zr2 20k miles . Also upgrading cv shafts to hlep with vibration in 4x4 . That is only thing I noticed with my 3.5 lift which ran out to 3.25 installed I believe thr Dssv coilover/struts will give me 2 inch ? . So do I need to grab a 1.5 spacer kit ? To maintain thr 3.5 setup . Also any suggestions UCA's at this height Rough country s are decent but ball joints only lasted 50k Miles. I appreciate all insight and suggestions.