Poor handling with new Hankook 19.5's - anyone else?

I replaced my 31’ Itasca’s Michelin tires with Hankook “245/70R19.5” 3,500 miles ago. The tire company put over 100 lbs. in all 6 tires. I reduce the pressure to the 70 lbs that Michelin’s weight/tire pressure guidelines recommend and I had used for over 40,000 miles with good results. The Hankook so far is handling about the same the Michelins did.

I did check with Hankook and they advised me to use the same pressure Michelin recommended.

Dave