PVR is 28 if I recall correctly. Currently it's 579-590 (soon 578 as well) & 1003/4, 1013, 1028, 1030-1042, 1044/6/7 in use with others away for paint. That's a total of 32 (33 with 578) so I think 4/5 buses of the road a time is rather tight, hence why 933/4 have seen use.
Away for paint right now is 571-576, 1043/5/8/9. 577 will join them soon i'm assuming, considering it's just left Livingston after a month off the road for an MOT test at Longstone. I then expect it to head to Seafield after, similarly to what happened with 575.