If the big goal is to get the tumor to stop bleeding then try some styptic powder right on the bleeding areas.
Check the various oils you are giving for vitamin E because while it is an antioxidant it can also promote bleeding.
If you have not consulted a veterinary oncologist you may want to do that. This site may help you find one
http://www.acvim.org/Specialist/Search.aspx
Did the vet ask you about neutering him? these sorts of tumors may be testosterone dependent and removing the source of testosterone may slow things some but also might not at this stage.
Hope this helps you!
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