i did warned u in my last post that this design will not work , water will run from sides and below & stone placement is critical, i think u shud call herzausstahl to fix it lol it was his idea .
me and many of us pointed this too that fill pond then run water and then adjust , there shud b some distance between spillway and where the water falls to see good effect , this cascade design is admired by few too but this is contrary to waterfall , its made to break the current and make mild sound .
.... imagine if u remove all the stone but the last one or leave the 1st one only and let it fall in pond , water will have greater velocity , sound anf visual effect some ppl create small pool before it falls down that gives good effect and pressure volume too .
also keep in mind ur pump pressure will decrease as u pump 3 ft heigh so to cover , the width of the water fall wil need to b narrower , may b half size if u dont see considerable flow , other thing is the flag stone that is giving u the waterfall needs to b sharp and thin , if its rounded and thick , it will not throw water infront . (ur 1st flagstone is best for it)
i would say ur pond as whole is looking very beautiful ..to b honest the rock work inside and gravel etc looks very professional . the thing is we all did mistakes and had undesirable results thats why we like to share them , i have made this design too then rebuilt it several times until i get what i want and thats the fun ie ongoing progress improvement as we observe and work on it , we get to see how water behaves and how rocks effect etc then we get more understanding daybyday . so its never end of the world lol thats the fun dont b frustrated or impatient its just beginning