Ok - Disagree with you here.
Awesome set of video’s you posted up, they help heaps with diagnosis of what you need to concentrate on.
1 - Learn what is causing your Hammie injuries - looking at the video’s, i’m leaning towards tight Hip flexors and Thighs - either or both of Lack of ROM and Knotts.
2 - Back mechanics - in certain frames when pausing, not only is your back rounded, your entire body position looks like your sitting in a chair… This is not a lack of strength, but tightness and not know how to Hold your Core Body Posture when under load.
3 - Hip Height - You have Zero. Your entire Torso holds still and the arms/legs are rotating around the Torso. Your power has to start from your Torso and radiate outwards - currently your power is all coming from your Limbs. Extra gym strength wont fix this with Barbells etc.
4 - Your arm mechanics - your elbows are pocking out to the side like chicken wings, ready to attack the guys ears in the lane beside you… 
Before any extra Squatting strength, speed endurance or general fitness will help you, you need your mechanics fixed. I’m sure you’re aware the Forums make it nearly impossible unless your constantly video taping etc.
You either need to find a specialist coach, even for a week or two.
Or, get that camera, camcorder out, and in GPP, don’t progress from one exercise to the next until it looks good on film. A 12 week GPP with a 6wk SPP will do better than 6wk GPP done wrong followed by 12wk Spp.
You have a full yr to get ready, forget about a triple periodization this yr, go for a Double.
Hope it helps