how are you putting line on the reel?
i was having a similar issue a while back(except i was struggling to get 30yards

) with a reel i usually had no problems casting and it turned out to be how i had put the line on. i just left the spool on the floor and wound on, usually i used to put it in a bucket of water and ensure the line came off the spool how it went on. sure it couldnt make much difference i thought
go to a beach or a field and drop the lead and walk back 100 yards leaving line out, then retrieve it and try casting, nice and slow and see how that goes. if it seems to sort it then buy a line loader, got mine for €10 and no probs since and its easier than the bucket method