I've been using the 5x5 routine and have made steady gains with the weight using seated barbell press for my core shoulder exercise. I stopped getting 5x5 at 145 and switched to 5x3 on the last three trips I'm now at 160 and it's getting tough to complete it all by myself. I use to do half reps and only go down until my elbows were at right angles but now since I started 5x5 I've been going clear to my clavicles, for the full motion. How can I keep the gains coming I feel like I'm rapidly approaching my limit for seated shoulder press. Should I switch to a standing push press for a while?