Given it's been established the use of speed tape is an approved repair i.a.w SRM, what would be interesting to learn, is, what limitations are placed on the total surface area permitted to be covered and / or specifically defined area for small repairs.
With regard to the wrinkles, I stand by the poor application technique and would now also add, as has been mentioned, the cleanliness of the area prior to application.
I would also add, irrespective of type, I have never, ever, cut a piece of speed tape to size when it is in-situ on an airframe...it's not difficult to approximate the amount needed, cut from the roll, check, and then trim accordingly
The Tech Log entry was mentioned...and yes, it would make for interesting reading...even more interesting would be the name / stamp of whoever certified the repair(s) and certainly the one in question nearest to the fuselage.