But we do. I have what we call "the wall of Europe" on my doorstep, thousands and thousands of amateurs running 1.5kW into big beams on big towers. Yet I managed to get confirmed contacts in over 100 countries in a couple of years with just 100W and home built wire dipole antennas and 91 countries in a weekend with a small home-made Moxon beam. I've made contacts with 100W whilst out mobile and when I was a foundation license holder limited to just 10W I made plenty of DX contacts then as well and at that time I was using an Imax 2000 and a dipole made from speaker wire.
As a freebander before becoming a ham I used to make plenty of DX contacts with a Superstar 3900 running 12W into an Imax 2000.
We don't understand it because what you're saying doesn't match our experience.
You ask what experience we have with a small rig and something like a Wilson whip. I've done over 1000 miles on FM with a 4W CB and a Sirio 3000 several years ago when we were at a solar minimum. Actually thought I was getting a rig check from a local at the time until they said where they were.
I think sorting your antenna
SYSTEM would be better to start with and then up the power. I put system in bold for a reason - the bit on the other end of the coax you plug into your rig works as a complete system, not just the bit that sticks up into the sky. Knowing how it works and optimising it for the best performance possible will outweigh just adding more power to a poor antenna system. Go to
KØBG.COM and read it all. If you don't want to read it all pay particular attention to the Antenna Efficiency, Grounds, Antenna Mounts and Bonding sections. The last one can have a very big effect on your antenna system efficiency. If you install it right you should find you have to shorten your antenna as the resonant point should lower. From starting bonding to finishing mine dropped by 300kHz, equivalent of lowering the resonant point by 30 channels!! Thats a massive jump in efficiency and has lead to many contacts not believing I'm mobile.