I have done alot of plyos in the past with great success. I have also done alot of hill running [ loaded and not ] I used to do some overspeed training as well . I trained agility like crazy , at times twice a day 6 days a week . From your posts it sounds like you are a player . What I mean by that is that you understand the game and have good instincts .It just seems like you weren't as blessed as some size and speed wise. But believe me bro , guys like you create alot of fear in the guys that you will be competing with . You rise the bar higher and don't make sily mistakes and you never take a play off. And given a chance you are going to smash into someone with some serious intent. It makes the gifted nervous , I used to see it . They will often hate on you , but don't get discouraged , you can rattle those guys.
As far as training goes let me know if you want me to design a program for you and I would be glad to help you all I can. Just PM with details on what you hope to accomplish and what position you decided to try out for. I still think inside LB is the way to go .Make sure not to over stretch , relax when you run [ most white guys run too tense] , and make sure your quads / hamies have the propper strength ratios. Make sure to be a true student of the game it will help see things much faster . When you tackle keep your head up and elbows in as well as your back arched . Explode through people ,but wrap up . [ pro scouts love that shit , and tackling is getting worse and worse evry year. so set your self apart] Walk with your toes sightly turned in , scouts look for this , because shows good balance. If you can get up to 245 with about 4.7 and very good agility . You will get some to give you notice definatly. Especialy if you play strong special teams and are one smart but mean bastard. Good Luck , if I can help you out in any way please let me know . It would be my pleasure . I love this shit . Now get out there and bast some fools and suprise some people . [ maybe even your self , go to war bro ]