DeltaV readme for a succesfull Phybi Return
dV numbers based on a test i have done from lower kerbin orbit

From LKO (86km) to Plane Change (inclination 12) to Phybi = 400 m/s
Phybi Intercept Burn = 1000 m/s
Phybi Capture Burn for 800km x 800km orbit = 140 m/s
Lowering from 800km orbit to a 50km orbit = 260 m/s
From a 50km orbit to landing on Phybi Surface = 720 m/s

Total dV needed from LKO to Phybi Surface = 2520 m/s based on numbers above

From Phybi Surface to 50km orbit = 780 m/s
From 50km orbit to Kerbin Atmosphere Re-Entry (35km) = 200 m/s

Total dV needed from Phybi Surface to Kerbin Re-Entry = 980 m/s

Total dV needed for a return trip from LKO to Phybi Surface to Kerbin Re-Entry = 3500 m/s

note that all numbers are estimates and upped to a round number. It depends highly on your efficiency of nodes and adjustments!
Adding an additional 500 dV would be adviced!
