I have the same issue with the cruise speed and sent a ticket yesterday about it. In real life I fly warriors with 160 HP engines and no wheel fairings. 2500 rpm gives a TAS of about 110 knots. In the JF Archer I can barely reach that speed at normal power settings, and can only reach 115-120 KTAS if I firewall and over speed the prop in cruise. Keep in mind the archer has a 180 hp engine and wheel fairings, so it should perform better than the warrior, not worse.
This is in FSX boxed with windows 10