End to End Encryption - Reverse Proxy

We are experience a huge data loss due to not begin able to use a reverse proxy with Cloudfront. Within Marketo we are losing site on the individual opens for emails and can only see the mass numbers. Our team has exhausted its efforts to resolve this issue with support and now we are turning to you all. We can not disable the Cloudfront piece as it will effect all other business units who need this security. Support has told us of other using the reverse proxy via Cloudfront/Cloudflare but it does not work for us.