Good morning AndrewRothman,
Thank you for reaching out to the Microsoft Advertising Community Forum! My name is Marcel, and I will be assisting you with this query.
I understand that you are trying to reduce the number of low-quality conversions coming from the Yahoo network.
While we cannot stop the Ads from showing on Yahoo searches, we also cannot bid lower for a search network specifically. You will only be billed for standard-quality clicks. Clicks that have been determined to be low-quality or invalid will be credited automatically to your account.
We have more information on this at this link: Monitoring clicks: Telling the good from the bad (microsoft.com)
I will send you a private message so that I can continue to support you with more account related information.
I hope that you have a great day further!
Kind regards,
Marcel | Microsoft Advertising Support Specialist | 800-518-5689