which client version works better with Pol 0.99 Distro POL099beta-2010-01-02? I'm currently using UOML 4.0.11c

if im not misteaken POL was modeled around Mondains Legacy and works best with it, however if you use revisions (i dont suggest for a live shard as there could be unforseen errors and its a live development situation) you can use High Seas 7.0.0.0+ clients

Several client features Distro099 uses are from v6.0.1. This works best with 6.0.1 and higher. Only thing that come up in my mind is the buff icons and the damage notification that could potentially be harmfull if you are not using those versions..