Don't know if this is really pertinent, but here is the deorbit procedure I use in the stock DG.
1) First, I make a orbital plane change so that my path crosses the base I want to land at.
2) Configure for re-entry. Open retro doors (you will need them to make small adjustments), deploy airbrakes (so you will automatically start slowing down during re-entry), and make sure you are buttoned up (nose cone shut, airlocks secure, etc.). Set AF CTL to OFF.
3) Turn retrograde and perform your deorbit burn. Use the Map MFD. The red square is your impact point. Kill engines when it is slightly ahead of your target base, as it will move back toward you during entry.
4) Turn prograde and then HLVL. Set HUD for surface, right MFD to surface. Around 60,000 meters you will start to slow down. Set AF CTL to PITCH and RCS to OFF. You are now under partial aerodynamic control. Adjust pitch to maintain a vertical rate of around 200 m/s.
5) Do not restore full aero control until your speed is below 750 m/s (about Mach 2.5), and your altitude is under 17,000 meters. When these parameters are met, set AF CTL to ON, and test your controls with small pitch, roll, and yaw maneuvers. If all goes well, you have completed re-entry! It's all basic airplane flight from here.
This works every time for me.