Yes many fabricate custom sink tips.
In it's simplest form: Get on some water and determine the length of line and leader that one can cast/shoot most efficiently. Next put in some effort to determine the approximate weight of that length. Fabricate ones sink tips and note their specific weights. Label or code them in some way so they can be identified. When they are added to the end of ones floating segment, one will have to compensate for the added length/weight by bringing some line in through the guides to once again get that ideal weight outside of ones tip top.
If a tip ends up too heavy, one can start progressively clipping off segments until things come together.
Feet per second sounds exceedingly fast. Most are coded in inches per second.
