Micro/Mini XXX Replacement Brush & Spring Set

I bought these in hopes of replacing a ten year old worn out set, that just finally started acting up. Though I have an “Epic” mini motor, I actually decided to put these in a Losi branded motor, and after a short break in, mind you not even correctly done, it runs great. In fact the top speed and bottom end torque seem a bit better, possibly due to the slightly stronger springs. However the spring top end seems a little short and I have a concern that it might pop out, but hasn’t yet. Also by comparison, according to videos I’ve seen, it appears to be about as fast as a low end brushless setup. My setup; losi mini-t original with Novak spy speed control, FGr4S Flysky receiver, losi mini modified motor, and Airtronics micro servo, with 3s homemade battery pack from 18650 cells.