Need help with sweep cut


I think a change of method.
I would use mirror at end - this will simplify the sweep cut.
The path for sweep need to change to get the curve at blunt end.
For your sweep - try to sketch the profile "normal" to the path, rather than at an angle.
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Step 1:
Model - as expected?
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Step 2:
The path for sweep - extended beyond the cutting area.
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Step 3:
The profile for cutting - one side only.
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Step 4:
And mirror the body to finish.
I added a split face to show the temper zones - just because!