Since the max payout is and has been limited for a long time what's the justification for a huge increase in premiums on a policy that I've held for over twenty years other than a get rich quick con, especially when the increase far exceeds the rate of inflation and the co. will look to every opt out clause it can find

Because the risk perceived by the actuaries has changed.
and the co. will look to every opt out clause it can find
That is a fallacy. Insurance companies pay when they don't have to pay.
I saw a case last year where someone died and on the application for insurance they had all the Nos and Yes's where they should be. However, upon death it became the knowledge that the insured had been on regular blood pressure treatment starting a couple of months before the application. Big time non disclosure.
I will tell you what happened. The insurance company paid an amount that the insured's premium would have purchased given the likely premium loading that would have applied if he had told the truth on the application.
In actual fact, they should have paid nothing because the reality is that recently diagnosed blood pressure usually results in the application being declined or deferred until such times as blood pressure treatment is seen to be satisfactory for the person.
There is another reason they don't need to look for every opt out clause. They already know that people want to pick up some extra goodies so they build it into the premium. In other words the premium already covers someone picking up some freebies due to the claim but they won't tolerate a false claim that is about turning their policy document into a winning ticket for Lotto

as much as many people try.
You really need to spend some time in a claims office, especially for disability or income relacement insurance. You would not believe what you see.