i've had chronic achilles tendonitis for years. whether it be in my 10mm drop shoes or 6mm drop shoes. currently wearing new balance 1500s-6mm drop. need trail running shoes and deciding between 980s (4mm , higher stack heights because of cushioning,trainers) and 690s (12mm, lower profile, almost like racing flats). 690s feel like gloves on my feet and i feel fast and efficient in them, but wonder if higher heel toe drop will aggravate achilles. any recommendations?