Best Practices for Using Clay and Instantly with SpinTax

Curious about the best practice when using Clay and Instantly as a Sequencer, its related to using SpinTax to improve deliverability and test more variation in messages. If I create a clay table with Name Email Subject 1 Body 1 Subject 2 Body 2 ..... Then I can push this to Instantly and set the email templates up using just {{Subject 2}} {{Body 2}} for example this is simple but it gives me very similar emails, but obviously with some personalization created in Clay workflows. It seems it's recommended to use SpinTax on your templates in instantly so how are people using this setup approaching building their email templates, are they using Clay for the list and basic personalization tokens and then building templates more manually in Instantly or something different?