Thanks so much for the back comments. It seems there are 3 types of guys. The big guys that get size easily but have to work for definition, the slim guys that easily get definition but have a hard time putting on size and then the guys that grow big easily with lots of definition (I hate those guys…ok, not hate, more like jealousy). I am one of the skinny guys that have to eat all the time and lift heavy to put on any weight at all. Deadifts and squats are also a big help, as I believe they will signal your body to grow more than any other exercises.
You said since you have been away from the gym for a while you may not come close to pulling 405 again. I do not believe that. If not, you may be surprised how quickly you get back to that level, then beyond.
Best advice I can give for anybody wanting to pull a big 1RM (not including training, etc):
1) Be confident. If you think there is a chance you may not pull the weight, you will not pull it. You can doubt yourself up to the time you grab the bar, but once you grip it, you must believe 100% that the weight is going up.
2) Use a power belt. I used to use a tapered bodybuilding belt but it was allowing me to use bad form at times which is a big no no in heavy deads. When I switched to a powerbelt my weights went down because it changed my groove a little but it did not take long to get back to my previous level and then pass it.
3) If you use straps, stop, and start using a reverse grip with chalk. I think you lose too much intensity and a little rebound affect in you legs and back while you are wrapping the straps.
4) Have a buddy stand behind you and right before you bend down to grab the bar have him slap you on top of your traps….HARD. I cannot explain why this works but I know it does work. Josh Thigpen, a professional strongman that goes to my gym got me to try that and it works. There is just something about a guy the size of Josh slapping your traps and yelling at you that makes you want to grab that bar and rip it off the floor.