Unless the 10-20 keywords are low-SEO competition in nature to begin with, the attempt to stably rank them will be futile, in that it will require insane levels of backlinking per kw to get them ranked above the hundreds of thousands of competing sites using the terms. And their prospects of sustaining that ranking if achieved? Even lower percentage. Discuss adding true lo-comp keywords to the site to get the pages ranked more quickly and reliably.