Are there any known problems with Male Spiders being able to lock up?

i got this male spider about 800grms, aprroximately 16 months old and and i have been trying to get him to breed, all sorts of tips, tricks, from sperm plugs, to molts, adding males, putting the female to his tub, 3 day in - 3 day out, 1 week in, 3 day out, introducing him to the female when she's on shed and other tips.. all seems to have never worked. i havent seen him lock not even once. ive been trying to pair him since october 1st but till today, no visual locks.

im not trying to force him into breeding or something, here of age and weight.. i just gets frustrating sometimes when you feel you've tried everything but it didnt work.

any ideas?