Quote:
i always have my jib very tight but when the wind picks up, the jib sloops off of the forestay
It sounds like your jib halyard is too loose / your forestay is too tight. On the 16, the forestay isn't supposed to take any of the sailing load. The jib halyard system and the wire running through the luff of the jib take all of the "forestay" load when sailing. The actual forestay should be completly loose while sailing.
It also sounds like possibly your jib halyard line is stretching to the point that the jib sags when it gets loaded up.
The only other possibility I can think of is that you are loosening your mainsheet (sheeting out in puffs etc) a lot which causes the jib luff to go slack and sag. If you're sailing in overpowerd conditions, you should travel out the main and jib travelers, but keep the mainsheet in tight.
sm