'increasingly more frequent' is correct and usable in written English.
It is used to describe a situation in which something is happening more often each time it occurs. For example, "The number of natural disasters is becoming increasingly more frequent due to climate change."
The application of the distance protection for distribution systems is increasingly more frequent.
However, new market regulations and new policies adopted by operators require increasingly more frequent permutations, making the manual configuration activity particularly expensive.
Urinating in a cup in front of strangers is an "embarrassing" but necessary and increasingly more frequent occurrence in English professional football.
Given the tremendous loss and disruption caused by increasingly more frequent natural disasters of all types, we're confident that the NRI is an investment with a big payback.
In Spain the diagnosis of non alcoholic fatty liver is increasingly more frequent due to the interest given and the increase in obesity, manifesting during adolescence.
This would be of clinical relevance, as diagnostic workup of suspicious renal masses incidentally found by abdominal ultrasonography is increasingly more frequent and demanding.
The dirt roads grew increasingly narrow, the gunfire increasingly closer and more frequent.
Due to climate change, these disasters are increasingly more severe and more frequent.
But cities like New York City and Philadelphia as well as some more inland urban areas would likely be increasingly susceptible to more frequent and intense storm activity, the team found.
Admittedly, multiple daily insulin injections are difficult for many, and over time, appropriate glycemic control can be increasingly difficult with more frequent and severe hypoglycemia.
Moreover, global warming is likely to make farmers' lives increasingly difficult, by causing more frequent droughts in some places and worse flooding in others.
