Do you use gel? I've noticed that with certain gels, if I use too much my waves get string and limp. You can also try rhe supersoaker method to encourage clumps and some people say the denman helps too. Also, how do you apply products? Instead of raking them in, you should try just smoothing them on and scrunching if you haven't. When do you detangle and what do you use? Try a wide tooth comb or a denman. For some, after their final rinse they try to stop manipulating their hair which can break apart clumps. Hope I've helped.