turrets feel quite squishy

i see turret HP went up. But I also see this other change of a formula for aa's against turrets, and that formula i think is what is causing this despite the increase in HP.

Perhaps i am mistaken, and Riot wants these turrets to fall more quickly.

However, i played a game today, and i kid you not...I killed a nexus turret with Leblanc with 1 creep wave (not supers yet) and 5 auto-attacks. My auto-attacks chunked the turret like i was a 300 stack nasus. Granted i was somewhat fed, but seems kind of ridiculous. Unless the intention is to snowball games more quickly, (i.e. the item advantage greatly increasing turret damage (in addition to the upcoming new minions...?)) then i think this needs to be reconsidered.

I for one prefer the more team oriented siege turret taking vs. a single player/splitpusher snowballing and having such an advantage to take turrets as quickly as nasus