did you get the nuts right up by the flywheel end?
cut the end of your sealant tube in such a way that the sealantcomes out in a 10mm high peak that way you make sure it seals all the way round
also run your bead of sealant around the inside of the bolt holes in the sump as oil will run down every bolt if you don't
or you could just surround every bolt that's a good method too