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A nose cone will almost certainly tumble, particularly a tail-heavy one (as yours probably is, given the Eggfinder). Maybe not a fast end-over-end tumble, but it won't be ballistic. Your simmed streamer speed (32 m/s) seems way too high. I suspect you aren't accounting for the tumbling drag of the separated airframe itself (OR does not do this by default, and on all but the smallest rockets, airframe drag will overwhelm streamer drag)? On my cardboard framed high power rockets, "drogueless" descent speed is more like 15-20 m/s (OR sims much higher than that).
I agree, the nose is tumbling, and the ~20 m/s measured by the A3 seems reasonable.
The most recent sim from snrkl in post #57 shows ~20 m/s streamer recovery. Not sure where you see 32 m/s?
Anyway, streamers offer very little additional drag, and simulating them is questionable.