Brief Answer:
Several points

Detailed Answer:
first it depends why you aren't happy. if it is because two doses a day of a drug that charitably works for only 6 hours, you won't be very happy with another drug that isn't a lot different on duration.

if it is because of wanting more of an effect, this is getting to already a high dose and going higher than that is dangerous. if it is due to side effects shared by all narcotics like constipation or tiredness or queasiness, you might not find another similarly acting drug will be any different.

that being said 60 is about 16 and 80 is about 20.

never seen anyone on anywhere near that much and it seems dangerous

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Brief Answer:
I'm not doubting you

Detailed Answer:
and
" The original OC oxycontin was great for about 8 years before it was altered to deter the junkies which has now changed the effectiveness of this drug "
makes perfect sense. The way the drug dissolves changed with the formulation. How it then interacts with the gut, liver, blood brain barrier etc is going to be different when how fast it gets in and how high the level gets to (peak drug effect) is totally unregulated by the FDA and guaranteed to be different. The FDA just makes sure the total amount that gets in is within 80% of expected. And the 20% drop allowed would feel like 20% less.
This makes sense.

Short acting drugs leave the body in 6 hrs.
"Firstly I am not happy because it takes about six hours before pain subsides"
Doesn't make sense. I hit the on button of the computer. Taking 2 minutes to start up I can see why that might be. 6 hrs to turn on after hitting the on button? Something is not working. It implies the narcotics work only when they are not there. An addict would be LESS likely to say this, obviously. Your other statements are perfectly reasonable and there's every reason to believe that you are having the symptoms you say at the time that you do. It just makes no sense and there isn't any good explanation (and that includes psychological explanations, people who are crazy or lying to themselves or others wouldn't say this and wouldn't have this pattern).

There isn't going to be an explanation to make sense of a 6 hr gap til the pain starts.

If there were an explanation, it wouldn't get published because it wouldn't make sense with what is known about the drug. Like I could say, "Gee, this could happen to the people in my family because we don't actually have the wiring for the narcotics to do anything except make us feel bad (true). When the narcotic wears off, I feel better". But, I've never actually been on narcotics more than taking one dose (kidney stone) because the first dose felt so horrible I wasn't going to take a second dose. So, saying this applies to you is ..uh... overly imaginative.

I'd advise the same thing I did with the wife who had the computer act up. Stop everything and restart it. Whatever odd thing that is going on (and frankly, I would be making things up to give any explanation), will change with not taking the drug for a couple days up to 1 week. Then, yeah, switch drug. Dilaudid is a very different chemical shape. Fentanyl is also a very different chemical, more potent, and longer lasting than oxycodone, BUT it also has far more side effects, so, it isn't anyone's first choice.

Obviously, you've already tried other modalities than narcotics (physical therapy, chiropracty, massage, maybe accupuncture; amitryptiline, muscle relaxers, spinal injections), but I will list them anyway.

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