In the past I've made myself a number of lead heads from Cortland LC-13. If your's is the same material it is 13 grans per foot, which I believe is heavier than the normal sinking portion of a sink-tip.
In my saltwater kit I have lead heads of 6 and 4 feet, which can be combined if needed. Normally I use one or the other on a floating or intermediate line. And for extra depth, I'll put one on a full sinking line
That one gives new meaning to "chuck and duck"!
In my trout gear I carry a 6", a 2' and a 4' The 6" goes between the leader and tippet as a substitute for split shoot.
Mine all have whipped loops