Well, the 7-9 system has performed very poorly over 30 days. From my observations, it seems the 7-9 range is a shade too tight, resulting in too many false signals and stop outs. e.g Yesterday it missed that lovely run down by going long practically on the day's high. Perhaps the backtests enjoyed a number of days when the 7-9 range was wider and more volatile? 
So from now on I'll be shamelessly using Jonny T's 7-10 range, with a 30 pip fixed stop, in the hope that it will reject more noise and only leap on the the back of honest, profitable trends.
Good news is that slippage has been minimal so that we now have 23 pips of "credit" when compared to theoretical results. The payroll data on Friday may well cause a dip into this credit, and then some! We shall see...
Results, FWIW
Date	     	top BO bot BO  Trade      Close 		      P/L       slip   th slip 	th P/L re P/L   Tot th	Tot re
22/9/04	1.2328	1.2286	 S 1.2286	Cl 1.2251	    34.5	    0 	      1	     33.5	  34.5	        169.5	185.5
23/9/04	1.2287	1.2249	 L 1.2287	st 1.2257	    -30.5	    0 	      1	    -31.5	 -30.5	      138	155
24/9/04	1.2278	1.2257  L 1.2278	st 1.2257    	-21.5	    0 	     1	    -22.5  	-21.5	       115.5	133.5
27/9/04	1.2274	1.2243	 L 1.2274	st 1.2244    	-30.5	    0	      1	    -31.5	  -30.5	       84	103
28/9/04	1.2304	1.2276	 L 1.2305	Cl 1.2313	    7.5	       1 	     1	     7.5	    7.5	           91.5	110.5
29/9/04	1.2325	1.2303	 L 1.2325	st 1.2303	    -22.5   	0 	     1	     -23.5	 -22.5	       68	88
30/9/04	1.2334	1.2313	 S 1.2313	st 1.2334	    -21.5	   0 	     1	     -22.5	 -21.5	      45.5	66.5
1/10/04	1.2431	1.2400	 S 1.2400	Cl 1.2409	    -9.5	    0 	     1	    -10.5   	-9.5	         35	57
4/10/04	1.2375	1.2350	 L 1.2375	st 1.2350	    -25.5	   0 	    1	    -26.5	  -25.5	        8.5	31.5
Days	30
Av pips per day	1.05 (steady on mate, Merrill will be headhunting for sure 🙂
Av pips per r/t	0.83
No round trips	38
Won	13
Lost	24
Percentage won	35.1
Total loss pips	-664
Total profit pips	695.5
Av loss pips	-27.66
Av profit pips	53.5
Av W to Av L Ratio	1.93
Well at least testing has cost nothing and the discipline has cedrtainly been salutary in regard to my swing trading.