So I am on my 5/3/1 week of my third cycle of 5/3/1. I decided to test my true 1RM this week. I am doing this purely out of curiosity and to see what my real numbers are. My question is will this slow my progress with the program? For my last set im supposed to be doing 1+. Instead I stopped at 1 and then added more weight to go for a max. I know those extra sets are what build strength so am I hampering my strength gains by doing a 1RM instead of repping out with the weight I should be using?

Also how do you go about testing your 1RM. Today I benched and my last set of 1+ was 215. I did that then put 235 on and did 1 rep, realized I could do more and put 245 on and did 1 rep. I deffinately could have gotten more but I stopped cause I assumed fatigue from the previous sets would interfere. Is there a good wat about picking which weight to try for your max single? Or a progression based on percentages? Thanks