How aggressive do you want to go? I have an SPS grip I bought cheap, way different than the STI grip. What I mean is the SPS grip is easier to stipple. In my experience the SPS is softer when it comes to stippling. The STi is much harder, have to keep the heat on longer. I'll show you an example of the SPS that I was playing with. It is SUPER AGGRESSIVE! Must promise not to laugh, I was trying different tips, one being a bullseye. Sent from my SM-G950U using Tapatalk