Anything is noisy on our crappy chip seal roads. A new Skoda has enough noise dampening in it to not make that much of a difference.
Heck, my old E36, you can hear a pin drop in the cabin at 100KPH on the motorway..
I like the RE003, Handles very well and has good wet performance as well.
Do need to get some heat in them to make them stick. The sidewalls are also quite rigid and holds a very nice line through corners.
The lack of soundproofing/damping and the in-cabin noise on the Octavia is one of the few things I really dislike about it. I know that some of it is down to the bigger wheels and the fact it is a wagon, but it is clear that it is an area where they do skimp Vs the VWs and Audis on the same platform. It falls well behind many other cars I have driven!
Like you say, a lot of it is due to the chip-seal; it is much better on smoother road and highway, but still disappointing compared to other brands.
Anything I can do on the tyres to improve it - even if a small improvement - is very much desirable!
Its a shame you can't "test drive" tyres really - I would love to try a few of the recommended brands before dropping the cash.