Should I keep feeding or start flushing

No need to flush. And those have weeks left to go.

Should I keep feeding northern lights from sensi seed starter in march

Those are hitting mid flower ish. Being outside may limit your options but the biggest mistake I see on this forum is chopping too early. The white pistils should go brown/red and shrivel into the bud before even considering chopping. You want to wait and let the calyxes swell too. Of course things like frost and bud rot can impact harvest timing.

Dmooney1958 said:

Should I keep feeding northern lights from sensi seed starter in march

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Feed until the end. You could probably cut back on the N though.

Thanks oregon coast fair weather here