Same here. Chrome is unusable with Hardware acceleration active.
I can confirm that disabling "Inject Intel" will prevent the double appearanceI haven't had much time to test, but, in my limited testing, it seems to work fine even though it appears twice in System Information. I read a post from another user who said disabling Inject Intel in your config.plist will prevent it appearing twice, but, again, I haven't had time to test yet.
Here is the link to the article.
https://www.macrumors.com/2018/03/30/apple-egpu-support-document/amp/
Yup disabled HW acceleration on mine as well and seems lag free. I see Cuda needs to be updated as well which I am sure will not be far off.