Thank-you everbody for your input! Health issues had me side-lined for the last coupla years. I was down to 120 lbs, and am past "middle age" (pushin' 60). Was finally able to get back in the gym last Spring, and joined a dojang at the same time. I threw myself into both head first. Was crankin' hard 5-6 days a week for 5 months, then got sidelined again for 2 months. I'm back in the gym and/or home gym every day, and will be back in my classes (four days a week) soon.
Right now, I'm focusing on technique and endurance- actually, I'm hyper-focused on technique AND getting xxx # of reps in per kick. And yeah, if it's falling apart then I either slow waaay down and and focus on where it's breaking down, or I move on to another type of kick and finish the troublesome one at the end of my drills.
Thank-you again All for chiming-in. I'm going to borrow a little (or a lot!) from everyone.