Uhm, if I recall correctly, Biplanes are more maneuverable than Monoplanes, especially in this time period, and the major issues with drag for a biplane only start to pop up at 350kmh/220 mph, so until we get 600 or so horse power engines we should be fine and even if we do they probably won't be seen until the end game, where we could still use biplanes anyway unless we somehow get early ww2 tech. Besides, we have more experience with biplanes and switching all production to monoplanes is literally catch up in every single way, and its not at all thematic to use monoplanes in ww1 when I can only name 1 notable monowing design from the conflict, that being the Fokker E.III and you can argue all you want about the Fokker D.VIII, but at max speed it can only go to 204 kmh or 127mph which is only faster by about 30 KMH or 15 MPH then the Fokker Dr.1 and while both have the same 110 hp engine, we don't exactly have something too much faster. So, I believe, that at this moment in time, the biplane is a better option and will be for some time. Besides, Sensei, you seem to forget the simple fact that altitude is needed for energy fighters, and biplanes have more lift then monowings which gives them an edge in climbing ability which allows them to have more potential energy, and the fact that the emu could climb better even was listed as one of its advantages over the enemys monowing.
Regardless, when this design crashes and burns, probably literally, I'm not taking the blame...
Edit: I also feel like mentioning this, the Rolls Royce Falcon. Ever hear of the Bristol F2b? It has a slightly more powerful engine than the one we have, and the aircraft can go faster than the Fokker D.VIII and at sea level and wasn't too much slower at 1000 m... and I remember someone mentioning the S.E.5a which can go faster than the Fokker D.VIII even at 1000m and is barely slower then it at 2000m and that has exactly a 200HP engine...