What follows is not the result of a close & rigorous study of the Greek
perfect, so my remarks are quite general and open to amendment and
elaboration.
Much of the time, the Grk perfect is slightly more meaningful than the
English perfect, so that we could wish for a hyphenated translation: to
take the Mark 6:14 ex., "John arose-and-is-still-arisen"--whereas your
hypothetical aorists are just "he arose." Or Luke 5:20, "Your sins
were-forgiven-and-are-now-still-forgiven."
And the caveat applies here as well, that any verb will have its own
peculiar nuances. My paradigmatic ex. is APOQNHSKW "I die"
APEQANON "I died"
TEQNHKA "I'm dead"
where the perfect particularly stresses the present result.
Your examples seem to me right on target, esp. the formulaic GEGRAPTAI "it
was-written-and-is-still-here-in-writing."
Mary
Mary Pendergraft
Associate Professor of Classical Languages
Wake Forest University
Winston-Salem NC 27109-7343
336-758-5331 (NOTE: this is a new number) pender@wfu.edu