sounds like the sealing washers under the nozzles. could be the feed leaking also, but youd need to leak a lot of fuel to make it start hard.
If you have upgraded the injectors, and have used bodies on new nozzles, the seal at the intermediate disc can weep fuel.
If thats the case, all you can do is have the bodies turned flat or try some anaerobic sealant on the threads of the nozzle retainer. Weston recommended some
CAT sealant for this, I have not tried it. If anyone has a cheap source for that sealant please let me know!