If you information is correct, I think you have established your perameters. It certainly would be reasonable to request that the seller's agent justify the asking price. Today9;s asking prices are usually not "cast in stone" with most sellers being willing to accept less than their asking price.
Keep in mind that if you are interested in purchasing this home and you intend on financing its purchase, that the home MUST appraise for the sale price for the lender to agree to finance the property. This may be your "ace in the hole." Any offer made should be done so with a clause that includes the need for the property to appraise for the contract price.