"more foundational" is correct and is usable in written English.
You can use it when describing something that serves as the basis or foundation for something else. For example: "This course in physics covers more foundational topics than more advanced classes."
It's something more foundational that's going on".
There's something more foundational that's going on here".
Hence more foundational material on the Doors, even as a refresher for jaded baby boomers, would have been welcome.
But the movement understood itself as engaged in a struggle for something more foundational: for citizenship, the status from which freedom and equal rights flowed.
An even more foundational question for the English NHS is the responsibilities of the secretary of state – the very duties which put the "national" into the health service.
"But I would wish they would do it in a more foundational way, a way that would help all the children instead of just a small group".
It should be clear that cities which rank high on global competitiveness often rank low on one or more basic foundational criteria, as London does on housing.
The Rock Hall has never seemed entirely certain of how to address the more odious foundational elements (egregious sexism; the manipulation and swindling of black artists) of the genre that it exists exclusively to immortalize, but still this was a particularly preposterous start.
We also emphasize the conceptual underpinnings of the subject, and compare them to more standard foundational work.
We conclude that forest structure (height) and resources (biomass) are more likely foundational characteristics supporting biodiversity rather than biodiversity determining forest productivity and/or biomass.
'The Common Pathophysiologic Origins of Diabetes Mellitus and its Complications Construct' is presented as a more accurate, foundational, and translatable construct of DM that helps make sense of the hitherto ambiguous findings of long-term outcome studies.
