The numbers you said are probably pretty accurate. VA salaries are definitely less than PP but probably higher in terms of salary/RVU. Little over 300K for 6k rvu sounds about right. In an ideal, busy PP with a lucrative position, could get 450k for 12-15k RVU. definitely alot of PP jobs for 35k0 or so for the same volume, depends on your desirability and such. Overall you always get paid more per unit productivity in the VA but theres alot of more "service oriented" tasks in the VA rather than straight RVU which are not accounted for.
Definitely recommend the VA HPSP. For starters im not sure why anyone would do military HPSP while this exists, and I suspect it will get shut down eventually. Military salaries are garbage and VA salaries are competitive with the radiology job market, with essentially the same service requirement