why not clone and start anew? I`ve one strain for 10 yrs now and I clone to clone. no mom. seed banks and lrg grows use this method. I've 7 strains at present and am starting 2 more. how would i keep 9 moms? no, the genetics aren't screwing up. I'ld say the older they get, the stronger and faster they grow.

perpetual grow w/no moms. easy as cheese.