Double Sided knitting symmetric decrease help

Hallo Dan , As you don`t give more details i can`t comment wether middle or side decreases are better [depends on the item`s nature] But i CAN give some ideas about decreasing , As a rule very rarely decreas at what will be an edge of a project, i prefeer to make decrease on 3rd & 4th stiches from and before edges. instead of knitting or purling 2 together, and if you are doing the Edge decreases , decrease one side by slipping the 3rd stich to right needle , than knit the 4 th than take slipped st over the knitted stich , on the opposite side just knit 4th and 3rd st before edge together ,,, this 2 decreases wil look as much alike as you can make .. now this SSK and SSP you mentioned wasn`t known to me , thus i went to a book to see what you meant ,, this book advices you to slip 2 st singulary to right needle as if to knit them than slip back than k those together than pass them to right than p next st than slip 2 tog over that purl ,,,,, Quite Complicated ,,, and i would say very Unneeded complication ,,, If i want to decrease 2 i use The SAME idea i do with decreasing 1 st ,, on one side i slip 1 stich , knit [or purl] 2 together take the slipped one over the 2 tog ,,, opposite side knit or purl all 3 together ,,,, I hope that solves your problem ,,, Ps if you make such a decrease in the middle of a row you get a 90* angle corner ,,,,, it is good for Middle of v neck opening , it is useful in Mittered squares etc.... mirjam

Have you tried using a vertical double decrease in the center?