4 months and I hit a flat spot

So until now my progress has been upward - literally. But this week when i did my 4 month testing I had problems - my standing vert was down about 2 inches and my run in vert is stuck at 27". I tried to do new maxes on squat and failed at both 315 and 305 after making 295 at 3 m0nths. So what happened?

I have to admit that the last two weeks as I have started running in prep for the bolder boulder that my training focus shifted and I didn't lift as much as I should have - Also because I have had very minor shin splints I have backed off plyometrics so I would be able to run without pain. I have also noticed that i get really sore lifting one day and then running the next. So what do I do now?

I am going to lighten up my weight lifting in terms of pounds and re-focus on speed of lifts ( I am going to remember that F=MA - so faster lifts produce more force than slow ones. I had started using 105 as starting weight for my squats and topped off at 205 in my 6th set. I am going to back down to 85 lbs to start and 185 to finish. I am also finally going to start using the jump rope - the program calls for it 5 days a week and I have done it exactly 0 times so far. Hopefully this isn't an issue with the shin splints. I am going to use it 1-2 times a week interspersed with my running workouts. I am also now riding my bike to and from the office - not exactly a plyometric exercise - but I figure that my legs will get some benefit from it.

Touching 10'7" isn't bad, but I really want to get up to 11'. Hopefully the final two months can help make that a reality.