You're picking random numbers to try to make a comparison that's not meaningful. 292 groups applying for tax-exempt status had names contained "tea party", "patriot", or "9/12", who were all given more scrutiny, and only 20 groups applying for tax-exempt status had names contained "progress" or "progressive". Of course, those numbers you care about are only about a third of the groups given deeper scrutiny - the large majority of groups investigated for possibly being political groups (and this not allowed to claim tax exempt status and hide their donor lists) weren't right-wing groups, they had terms like "Democrat", "Occupy" or "Israel" in their names, and only a third of the groups were right-wing groups, so the scrutiny wasn't politically biased against right-wing groups. If anything, it affected more left-wing groups than right. It was still a bad idea to use a list of terms to trigger deeper investigation, of course, but as the "BOLO list" system was put in place by a conservative Republican who was trying to make the system more efficient and consistent, and was applied to groups across the political spectrum, and the outcome was that only a third of the groups affected were right-wing, the evidence suggest that it wasn't politically biased against the right-wing.
The political bias that is most obvious is that the Inspector General's office in charge of the IRS audit had been asked by House Oversight Chairman Darrell Issa (R-Calif.) "to narrowly focus on Tea Party organizations". And, of course, Issa kept most of the testimony secret, selecting a few bits to try to distort the program as anti-right-wing.
The reality is that using a list of terms to watch for is a bad mechanism, because it's substituting a mechanical rule for human judgement in making a determination about a group's being political vs. social, and that's wrong. But if you ignore the rhetoric, the facts don't support the accusation that the BOLO lists were aimed purely at right-wing groups. The real problem is that Congress passed a law requiring the IRS to make an extremely vague determination ("primarily political") so the IRS came up with a system for making that determination that pissed people off.
Looking at the lists, I can't see how most of them were ever granted tax exempt status. How can a group with a political party in its name, that raises money for and donates time to political candidates, not be a political group? The IRS should have rejected far more of the groups, both Republicans/Tea Party and Democrats, and instead of seems like all they did was ask a lot of questions and then approve almost every application, which seems a bit pathetic.