Replace them with new one, and put RTV in the correct spots making sure to follow all rules to the T [like cleaning the surfaces of oil with appropriate cleaner]
But here's the clincher that you are actually looking for: ditch the little rubber spacer things, and put washers[about 2 per bolt]! I was thinking about how I long suspected the rubber things as being the reason they get 'loose' over time. Then when I did my head gasket, I really saw how loose my rear VCG has gotten.
[ i knew this had to be happening because I was smelling burning oil all the time from it leaking on my exhaust manifold only since last time I worked back there where i replaced the VCG and replaced all the little rubber things] then i knew the rubber things sucked a..
So, I suspected I could chuck them and use some washers and put a dab of RTV at the bottom washer. By accident, trying to see pictures of other people's head gasket failures [hard to find picz so far], then i read others had already thought of using washers [not sure of the RTV part, seems more like just my idea and not what others have done] and had great success, on the Toyota forum.
By the way, increase the torque you put on there to somewhere around 14 ftlbs since you have the washers now and supposedly that will not only help seal the gasket, but the bolts are designed to handle that torque.
Just trying to spread the theory around. Haven't used it myself, but I will in the future. Post if you tried it and it worked.... and any thoughts you have