Sounds like you did the increases correctly.
Are you sure it is too long?:
Is it longer than the pattern says it should be?
Is it longer than desired for your intended recipient?
Does it just look too long to you?
Was this sleeve worked flat or in the round?
Is it separate from the body and needs to be attached, or was it worked while attached to the body piece?
Sounds like it was flat and separate, and worked from cuff to shoulder, which is how your model should be measured as well, from wrist to top of shoulder, not from wrist to underarm.