You know, if you divide your plant and replant in a group of three clumps slightly separated from each other, it will look like one big mound much faster. I've done that with several of mine, most notably in 2011 when I had a large hosta sale to benefit my church renovation. Once you've got them out of the ground to take a division or two, just continue to divide them up. Most of them did wonderfully, but I had a couple that didn't grow as well after I did that. By three years later you'd have to look really closely to see that it's not all one large mound.
'Raspberries and Cream' replanted late May 2011
Same clump late July 2014
