Regarding BI Publisher Memory Guard Error - max amount exceeded - can we modify the guards?

So we have a report that a consultant created using a DM which seems to have nothing to guard against pulling large amount of data over time (at first it perhaps worked as we had smaller number of data migrated) but now it seems the report is choking when pulling information. I've found that the default values for memory guard (300MB/500MB) is perhaps part of the problem - or in the interim may help just to get the report going - but eventually modifying the DM may be the route to go, but that's for another post (how to add