I have used Behotec c50 retracts in 3 large models ranging between 18to 35 kg. I have found them excellent and robust. If you have a multiple wheel bogie and large wheels of 4" plus you may find it difficult to pull the gear up. Single wheels 4" on a long oleo leg is not a problem. On my Horten I have a 6" nose wheel , but have a second ram to help lower and retract the gear. The Behotec struts are superb if you can find one suitable. On my Arado which has a 4 wheel bogie I have just converted them to electric and this seems to work ok.

As you model is similar size to mine I would consider the Behotec c60.

John