[RTTY] What should I expect from 3db improvement in SNR?

[N2WQ]

The WPX RTTY contest is one of my most favorite contests of the year.  Thus, I was very disappointed when I could not meet my personal goal of 1000Qs and 500 mults (SOSB40HP).  The end results was about 950 Qs and 511 mults for a total of about 2.2M.

I am in the process of reviewing the required improvements to my stations and so far I have identified quite a few, ranging from dedicated RX antennas so I can hear better over the North Pole (worked only a dozen or so JAs), 4SQ TX antennas for fast switching between EU and US, etc.

The one improvement that I am not quite sure how low to prioritize is a full legal limit amp. Right now I have an old Ten Tec that I run at about 750W to make sure it doesn't overheat.  So, my question is what should I expect from doubling my power from 750 to 1500W?

In my mind, the answer is somewhat complicated by the fact that 99% of the time I do not get any requests to repeat, i.e. I deliver a decent signal around the world.  I also don't wait in line for pileups.

On the other hand, my run rates peaked at about 80/hour, which I don't think is that great, particularly compared to what I see other non-DX stations are doing.

So, recognizing that I have a few other improvements to make, what should I expect from extra 3db SNR on RTTY?

Rudy N2WQ