I stepped the mast for the first time on our new to us Venture 21 and after hooking up the boom it seems alittle low. My question is can you raise it? After we raised the main sail we realized there is a bit of slack in it... Is that normal when yard yachting? (aka not on water and making sure everything works properly) or should the sail have tension in it? If I raise the boom it will have more slack in it than before is that ok? Please let me know.