ORIGINAL: TFOX
It could be too much letoff on the newer bow or it could be draw length is too long.
Could be the feel of a 1 cam verses the 2 cam.
Many things could be the issue,do like MeanV suggest and shoot some bows,pay particular attention to letoff and draw length.
This is exactly what I was about to post. If it is to long, the valley might be catching you to abruptly..... just a guess
Shane