Seiko skx013 power reserve

Is the same history with 7S26, I found that that caliber always presents problems with all the balance system, I disassembled about 8 now and I don't understand what exactly is, even after a full service its only between 169 and 245 on amplitude, must be at 270 (minimum in any position) to my understanding. Once I did replace the whole balance system and reach 300. So sad, I even thought that is an overrated movement for all that you can heard about it on YouTube en read online. So, short answer: they may be disposable in most cases, upgrade to NH36 (only time will tell if is just the same history). Regards!