Email Subscriptions - Very Poor Image Quality

We are seeing extremely poor quality images within the email and the attachments for Report subscriptions coming from the Power BI Service.  The images are so poor that we will not use the subscription option until we have a better solution.   

We need to push reports to about 20 users but we a small business and PBI Premium and PBI Report Server are cost prohibitive for us.  We had such high hopes for email subscriptions but they have been such a big disappointment so far.

Is there a way to improve the resolution of the images in the email and attach a PDF file rather than a PNG file?