That happens. On a side note, AS5 is popular, but that doesn't make it good. It's pretty mediocre as far as pastes go. Aios respond much better with a tight seal on the cpu ihs, tighter the better, and what would work fine for an aircooler isn't always going to work for a pump all that well.
When thermal testing an aio, you really should run it for about half an hour per test, this gives the coolant time to acclimate to the cpu temp. Afterwards give it about half an hour at idle to drop to that temp. Repeated consecutive temps will be off since the coolant temp will affect the energy absorbtion rate.
P95 Blend isn't your friend. For p95 you'll want the older 26.6 version and run small fft. This'll put you at a clean 100%, gaming equitable load temp. Any version after 26.6, ibt and occt w/linpack will put the cpu at @ 130% load temps since they use AVX and other unrealistic instructions that don't apply to gamers or general usage, only a select few professional apps. P95 blend uses a mixture of large and small files and some ram, so you'll not get a decent baseline temp.
End result is you get some seriously funky temps that under almost any usage you'd use the pc for are totally unrealistic.