When the plumber ran the dwv for my bathroom additions, one appears to have been set at 11.5 inches from the finish wall rather than 12. I believe most two piece toilets have enough Clarence in back of the tank that this should not be an issue, but it looks like the Toto brand has a much tighter Clarence. Am I correct? If so, are there other units that you would recommend, short of a 10 inch rough? Thanks much for any info.