Randy Bachman wrote: But the tops of the mounds stay too dry and the plants arent doing well without hand watering
Sounds like your soil/clay is hydrophobic or maybe you have too much mulch on the surface?
I'll just tell you what I've done on some of my berms to increase hydration and decomposition. I ran 1" poly pipe at an angle, down to the bottom of the berm, about 3'. The other end is sticking up out of the side of the berm and I plugged it with a 1" coupler (barbed x MIP) so that I can unscrew it when needed to feed a garden hose into it. This will allow water to go straight down into the larger biomass at the bottom of the berm's trench to speed up decomposition and hydrate long term. Just make sure you don't over saturate, or you will most likely get anaerobic bacteria growth.
I've also tried using microsprayers for drip systems, but I personally hate those things. Best results I've had with those is flipping them upside down so the water sprays downward, rather than all over the place. I much prefer using dripper line (6" spacing) and/or multiple 1gph-2gph emitters running through the center/top of the berm.
You could also mix in some sand into the clay to help aerate. Just a thought.