I'm using a slimmed down version of this skill:

https://github.com/steipete/agent-scripts/blob/main/skills/c...

The important bit I found is to explicitly remind Claude that Sol 5.6 is a very smart and good model; otherwise, Claude performs its normal condescension towards any non-Claude model behavior and insists on reading all the diffs in full and testing all of Sol's work, negating any token savings.