Seymour Duncan STK-S4M Classic Middle CR

I bought it to replace Seymour Duncan Single SSL-5 in middle position on my Steinberger GU-deluxe Pickup configuration at the time was Seymour Duncan SH-4 bridge, SSL-5 middle and SH-2N neck. My main reason was SSL-5 is to quiet for bridge neck combo and volume drop was significant. I was hoping to rectified volume drop with this pickup and it did but just on inner 4 strings. String D and G perfect A and B almost perfect but both E and e are way off almost as SSL-5 and then it hit me that pole spacing is also a problem. Only solution to my problem looks like some type of Hot Rail in a single coil housing. Steinberger GU-Delux is narrow string and close spacing pickup setup so there is no big selections of pickups that will physically fit in routed channels i'll go with Seymour Duncan SHR-1B Hot Rails and hope for the best. As for Seymour Duncan STK-S4M Classic Middle pickup it sounds perfect on its own as far as I can hear and when it is in proper spaced string guitar it probably sounds magnificent and it was built for Strat not a Steinberger. if you are using any kind of Stratocaster get a full set and 5 way two bank switch and you get 10 pickup positions