Here is an approach you have probably never considered to help bring your lagging calves up. Try these 2 approaches and watch what happens! Instead of doing reps on the calf machines ( donkey calf , seated, standing, leg press calf, etc.) Choose a weight that will let you hold the contracted position and do holds for time. Around 30 sec. to one min. should be your goal. Use enough weight to make it hard and vary your time and weight for variety. One approach would be to use a weight you can hold for 20 sec. , adding 5-10 sec. per workout till you get to one minute then add weight and go back down to 20 sec. Experiment with the number of sets.
The next exercise is just walking on your toes with calves fully contracted for a set length of time. Use dumbells to add resistance.
These approaches put your calves under tension much longer than the typical methods and may be exactly what you need to bring your calves up.