Andy ,
I am not being a smart ar$e .
I have seen some of your rocker info re the 240 head and you said Cranes were fine . All I have seen on the 270 was your pictures/dyno test and use of offset high ratio ones.
TrickFlow list a non offset rocker . markz528 also notes the listed rocker is not offset

Quote from Summit -
Q:
Do these heads run an offset rocker??
Asked by KEITH E on September 12, 2017
A:
Thank you for your question. The Trick Flow Specialties TFS-61617801-C01 cylinder heads do not require an offset rocker arm. They use all factory-style big block Mopar shaft mount rockers.
Summit Racing Answer - October 16, 2017

If you can link your rocker test , would be great .
Someone's wires may be crossed .

Tex