[RTTY] Best MMTTY profile for noise and weak signals?

[Stephen/Marilyn Haines]

I would love some direction about MMTTY profiles from more knowledgeable 
operators. I run 60-80 watts to a poor homemade vertical only a few feet 
from the side of our duplex. Several times Charles KK5OQ has told me 
that others are responding to my CQ, but I can't copy them -- just a bit 
of signal and a few letters.

Local noise level on 20 is a steady S7, with less noise on other bands. 
I'm running a K3 with 2.7 and 400 hz roofing filters. The computer is a 
9 year old laptop, 950 Mhz clock, 256 MB RAM, running up-to-date XP. 
MMTTY is 1.68a that I normally leave on the default profile because I 
don't know enough to choose another one. In non-contest situations most 
signals are just over the noise, or in and out of the noise.

What available profile in MMTTY would be best for me in these 
conditions? Secondly, what bandwidth on the K3 is likely to work best? 
Chen, I would really appreciate your opinion, if you have the time to 
respond.

73 de Steve ZP9EH (who worked very hard for the 75 QSOs in the roundup!)