I made the switch to midfoot striking and it's been a game changer for me. Less impact on my joints, fewer injuries, and I've even seen an improvement in my pace. Worth the effort, imo.
Been there, done that. Hill repeats can be a great way to strengthen without high-impact stress. Start with shorter hills and gradually increase incline/distance. Also, focus on proper form and don't overdo it. Patience is key.