I brought my Senegal, Pepper, home when he was three-months old and already had a typical wing trim. He experienced many hard falls from his play gym and cage that led to broken tail and wing feathers. When his flight feathers were replaced, I had a slightly less than typical feather trim done, but he still could not maintain control and safely glide or flap to the ground. More hard falls continued.
I have since allowed him to become fully flighted. He does have his difficult moments when he wants to fly to dad, but the safety he has at other times is most important to me.
My recommendation is to consider allowing Bumble (I love his name) to remain fully flighted. If you must trim his wings, be very conservative. Start with only the outer most flight feather on each wing. If after a few days he is still strongly flying, trim the next outermost flight feather. Continue this process until he is able to flap safely to the ground, but does not have strong flight ability.
Good luck in making your decision on wing trimming and with Bumble.
