Sound like a similar set-up to mine, no co2, well planted and only CRS stocked. I tend to concentrate on the well being of the plants, let me explain. If you have a healthy planted tank the eco environment within that tank (to an extent) takes care of it's self and in doing so the shrimp should do well. I have my lights (11w fitted as standard in the lid) on about 11hrs a day. I also use liquid carbo daily not sure it really does anything but I guess its better than nothing. I believe that It's all about water management getting a balance, get that right and you have cracked it. Once a week I do a minimal water change but before I do, I check the water parameters especially the nitrate level. I do these (liquid) tests one the day I'm do a water change and the day after the water change. In the vast majority cases I don't find any readings all are 0.00 including the nitrate. Hard to believe I know but what's happening is that the plants are doing the job of keeping the eco environment in balance. I do add a squirt of liquid fertilisers for the plants after each water change. My tank is not overgrown with algae the shrimp feed off the algae and once a week I put a small pinch of fish-food in as a treat for them.
Hope this helps