Special thanks to John Galvin at Allmerica Financial for supplying this notes.ini setting.
A Full Text Index query is bounded by 250 documents in the result set. You can use the niotes.ini to override this default by adding:
where XXXX < 5000. I have read that the FTI can become unstable as the setting approches 5000, so I usually do not push the upper bound past 4000.
If this doesn't provide all the info needed, then a re-work of the query is something to look at.