B W 802 Nautilus on hardwood floor...need help

You want an area rug and if you can afford it a wool rug.
If you are in a living room type set up and you cannot use sound isolation devices get either live plants or silk plants the larger the better and put them in the corners to help diffuse the sound.

B&W offers upgraded cones for your speakers, and there are after market options such as Black diamond racing cones, Orchard bay cones, aurios, etc. they will make a difference.
If I remember correctly the speakers take a 6 mm thread.

Hardwood floors are not the kiss of death you just have to work a little harder.

Use isolation bearings such as Aurios. This will provide one of the best isolations to your speakers. One Aurio can hold several hundred pounds so your speakers are not a problem.

Area rug, definitely, and put your speakers on stands, either Sound Anchors or the Sistrum speaker stands using Audiopoints. B&W speakers improve enormously on stands.

It might be you first reflection, I have hard wood floors also,and have a good sized area rug which seems to do the trick.

GEt a throw rug immediately in front of your listening area and try out isolation devices like Vibrapods

See the soundstage review on them www.vibrapods.com