I don't use feeder clubs to loan players out to. I control both my first team and reserve squad. That way my reserve/youth players have a chance to improve with anyone playing well being considered for the first team. I also aim to win the reserve league at the start of the season. You'll find when managing the reserve squad that any team talk given inspires the players as they know impressing you will earn them a place in the first team. Possibly try this suggestion instead of sending your players to teams with no promise of first team football or any development there.