I get around them temps with a Noctua NH-D14 while running the AIDA64 stress test on the same cpu, so yes i'd say them temps are perfectly fine.
You may want to run the test a little longer, say 30mins or so, 8mins isn't a very long test.
Dont worry. Haswell can take alot of heat. Commonly accepted safe limit is under 80° during stress test. Under 75° is even considered conservative... Thermal throtteling kicks in only at 105°. Some have run theirs at above 90° idle for months without knowing (lol i know) and without killing it...
The temps progressively rised and peaked at 8 mins before plummeting back down tp the 50's. They rose back to around 60 at the 16 Minute mark but never exceded their original peak temps, within a minute, they fell back down to the 40's and Stayed there