The only values I've been changing are floats. I use the base converter built into hex workshop, but there is a web calculator at
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ex: put 39 in the first field then click "Not Rounded"
down the page a bit you should see a field named hexadecimal and it should be "421C0000"
that is how I changed the jump heights in both the eboot and mp self (orig is 39)
wish I would have known it was this simple back when JB worked on PSN