I had a 2008 Octavia Mk2 and I think they had the same headlight lens set up as yours.
Totally agree about the high beam that seemed to illuminate every where except where I wanted it
The problem is the poor optic design rather than the bulb output.

I had experienced even worse on a mk1 Santa Fe which had such poor projection It was safest to wait and follow another vehicle while country driving rather than rely on my own lights.
Some cheap 100 watt replacements did help a bit short term but destroyed the UV coating on the poly lenses and they had to be continually cleaned thereafter.

Standard Halogen lights and bulbs on a Kia Carnival and Falcon were literally brilliant for country driving.

If you are going to upgrade the bulbs, which is the cheapest option, then get good quality items from Osram or Philips. They will use the same wattage as the existing bulbs but claim greater efficiency, probably due to using a thinner filament, so may have a shorter working life. They should have better control of UV output and less heat issues than any cheap own brand items from Supercheap or Repco.
I'd also avoid any that have a blue tint as that is just for that trendy 'blue' Xenon type appearance and sacrifice some light output to achieve it.

I suspect that the lenses in the Xenon fitted mk2 have better optics and it is possible those on the facelift version (2011?) were better too

There are a couple of threads with useful info on upgrading halogen bulbs on Briskoda in the Mk3 section.

I did nothing to my mk2 because of the results of my previous attempts and I had not discovered Forums at that point to know how I could have done it better.