'more major' is not correct and it is not usable in written English.
You can use the word 'more significant' instead. For example, "The news of the merger is more significant than I had expected."
There'll be more major local authority elections across England too.
We have more major [energy] problems to solve".
As a senior I can't take any more major risks.
Two more major construction projects were subsequently initiated.
Eleven more major roads are under negotiation, he said.
I just hope I can play some more major final.
More major work would surely prompt larger demonstrations.
There will be no more major entitlements for Americans.
Two more Major Leaguers jumped on board over the weekend.
Typically, this means 2+ or more major observations in either the regulatory or pharmacy component, 2 or more major observations impacting more than a single subject case, or 3 or more major observations across all subject cases.
However, there always seemed to be one or more major deal-breakers.
