Can you have partial misfire ?

[Jackstraw]

Hey everyone! Question I have is can you get some medicine in right spot but not all? I am new and still in the trial and error stage. I have a weak formula, 15/.25/6. At 30 units I got about 2/3rds hard. I increased it to 40 units and no difference. I’m using a 5/16th needle. Injections go in easy and seem to start working within a few minutes. I do have a stronger formula, 30/1/20 on the way. In the meantime I will increase to 50 maybe 60 units of current and see how it goes. Just wondering if I need to move injection site a little lower or it’s just weak formula. Thanks.