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You need to get one of these guys. Clip on side of tank, fill with food, wait for shrimp

It sounds like you need a bigger tank, or split your different varieties into more tanks (without going too small) to lower the density. fishmosy is spot on. High density living = smaller shrimp. I've had several hundred juvenile DAS in a 100l tank and they grow slowly and berry up at a small size. When I take some of those small shrimp and put them into a much larger tank (e.g. 20 shrimp in 400l ) then I see them moult more frequently and they grow quickly to the large sizes that you would normally expect. This even occurs if I move 2 yr old (but size stunted) shrimp. i.e. they "catch up". Being pro-active in your breeding program by culling and removing the poorer quality shrimp (however you might define that) is therefore a good thing to be doing to lower the density while simultaneously improving the quality.

Some of my shrimps.

if you attach it to moss you may experience the attached part go brown but not all the time. I have attached heaps of plants with no ill effects

I second OzShrimp & Fishmosy : patience & food You can try to put some food inside a small jug, they might come inside...