Yes ARC (as per the Andersen brothers book) is analogous to the aerobic bae training you do for running and skiing. A couple of ARC sessions a week will really help build endurance when combined with the strength sessions. We do have two very effective plans for ice climbing training. At your level I would recommend the beginner/intermediate plan https://uphillathlete.com/ice-and-mixed-climbing-strength-plan-8-weeks-beginner-to-advanced-intermediate/. We use this plan for a many clients and it works great. However doing your own plan is fine and it sounds like you’ve got a good start on it.