The Fw 190 got the 1.65 ata with C3 injection in the first supercharger speed for the Jabos initially (mid 1943 iirc), in the A-5/U17 which was later redesignated F-3 when mass produced in that configuration.
The Jabo variants use this setting, extra boost (1.65 ata) for low altitudes (below 1000 meters) with C3 injection in the first supercharger gear, including the F-8.
Later on the Fw 190 A-8 got in July 1944 a new engine setting, 1.58 ata for the first supercharger gear and 1.65 ata for the second supercharger gear, without C3 injection.
Now looking at the DCS Fw 190 A-8 cockpit pictures and the info one of the devs shared, looks like they will model it after a particular plane that was shotdown in June 1944, so in theory it wouldn't have this increased setting (only 1.42 ata for the fighter version). The extra power was activated via a red button below the speed indicator, which isn't there in the cockpit pictures they published.
So unless they confirmed it will get 1.58/1.65 setting it would be with the 1.42 ata 1700 HP engine power for the fighter configuration.
The A-8 isn't in a particularly good place in this situation, it is heavier with a high wing loading, and draggier airframe while having the same power as the 190A from the previous years. The speed is slightly faster than the Spitfire LF Mk IX at low altitude, but slower at mid and high alts. It will have to make hit and run tactics, and if it's caught in a bad situation it won't be able to run away in level flight, it will need to dive. The P-51 will be much faster at all altitudes, and looks like better climber and more agile as well.
Some graphs comparing the speeds of these fighters (the A-8 without the bomb pylon in both cases).
With the increased 1.58/1.65 ata power available the situation improves against the Spit at low/mid altitutes, though against the P-51 it would be more or less the same.
A good choice would be to have both options available, one for 1.42 ata and the other with 1.58/1.65 so mission designers can choose which setting is appropiate with the timeframe they want to simulate. For both early/mid and mid/late 1944.