I have the same breed pal had the very same problem. Fast enough just not picking up on lamp. Day time rabbits when ferreting and mooching catching for fun.
Only just got him catching on the lamp in march embarrassing really compared to some dogs at that age.
Had some help from gaffer (top bloke) off hear took me out and gave me some pointers on were I was going wrong. Dog acted up when out with his dog but one on one he is doing very well at the minute, recall, not hunting up but retrieving still needs work. It took him time to adjust to the lamp, but he missed 1st half of season thr