Hey gang - I recently had a controller jump on me for turning too early on an IFR takeoff, and I’m trying to research the right answer. Clearance was, “ On departure, turn heading 330, radar vectors to XYZ.” WX was clear VMC. After reaching a stabilized climb and and when I felt safe, I initiated my turn. I know about the diverse departure criteria and the 35’ above DER/400’ AGL criteria that define DPs. But I’m not certain if the context of those definitions translate to regulation (I.e. maybe I should have waited till 400’ to turn?) Anyway, wanted to see what everyone thought!