Allowable span and cantilever , point loads and paranoia

OK
Just re-framed for the window and I cheated a little with the distance between stud centres.
I have 670 between centres and the more I look at the distance the less I like what I've done.

There is a lapped join in the top plate corner ( common practice in the 50's?? ) and a rafter sitting 90mm away from the check-out for the stud I removed and 55mm away from the new stud, well within the allowable cantilever I think, what concerns me is the other rafter sitting 170mm away from the lapped join in the corner.

As I see it I have two options.
just add a short 90*45 in the left-hand corner to support the top plate a little or put in a supporting member spanning the 620mm gap.

90*45 ? 90*35 on edge?
Combination of both?
I'll do it now before I get the plaster on and it is finished and I'll feel better.
Comments? Advice?
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