I don't have strong nails either,I keep them very short as I want to gain more volume and some tone varieties.My nail lengths are not even visible if view from the palm.They shape of my nails follow the contour of my tips,I maintain the nails with glass file,sapphire file, polish the edge with fine grit abrasive paper starts from 800grit to 1200grit then 2000grit.
I also use Mane 'n Tail Hoofmaker "Hand & Nail Therapy" to strengthen my nails as recommended by forum members here,it's a great not so pricey product.
2017 Karel Dedain Spruce/Maple (Torres) 64cm
1998 Yamaha GD 10, Spruce/IRW 65cm
1988 Alhambra AL 8, Cedar/IRW 65cm