problems with my hybrid hazelnuts

hey folks! new guy here. hello from n. maine! this is for you hazelnut growers out there. i have 2 5yr. old hybrid breaked/ american hazelnuts bushes in my yard. neither have produced nuts. ones about 6ft. the other about 4ft. the 4ft. has yellowing leaves and not looking so good. the 6ft. is dark green, has put on some new growth but the new leaves are curled inward. they both were moved from my old property about 2 yrs. ago. the soil here is a terrible heavy clay w/ a lot of rock. i amended w/ manure compost/peat and took out as much of the rocks that i could. I've been feeding them w/ worm castings and jobes spikes 2x's a year. i barely water them as we get plenty of rain up here. any ideas whats going on? it looks like some kind of deficiency. i also have wild beaked hazelnuts not 50 yrds. from my cultivated ones and they're healthy and full of nuts. sorry for no pics. I'm not good w/ computers.

I wonder if you plants could still simply be recovering from being moved, especially if they were already large, had a lot of root damage, and/or were not cut back drastically at the time. Is it also possible the roots are too soggy? I know wild hazels are tolerant of poor drainage......but I have no experience with the hybrids, but I think it might be possible if they include genetics from a more dry-adapted species.
Do you know how to graft? Perhaps you could try moving some scions over onto the apparently thriving native hazels, while at the same time giving your plants a good pruning. I would back off the fertilizer until you see healthy growth coming in. Also, given where you live, they may already winding up the growing season anyway.....

thanks for the reply alder. yeah i thought water could be a issue esp. w/ my soil. when i replanted them, i amended w/ some manure compost but should have added peat. they're starting to go dormant so i think ill leave them be till spring. you think if i mulch them heavy w/ peat and light fluffy compost for the winter, it would help w/ the moisture problem as peat absorbs water? i know they have shallow roots. I've kept the weeds about 18in. from the bush. gonna prune the bottom and inside limbs early next spring. hopefully it will reinvigorate them. theyve grown a lot since i transferred them. had them in poor gravelly loam before so they didn't get a good start. gonna try and take a long screw driver and make some holes so the peat can get down into the roots. hopefully it helps.