Your suggested combination is good. PAIN CARE SERUM is best energy.
Please add MAHA MRITYUNJAYA MANTRA too.
You can charge a pain balm and cream for him to give more relief.
Please send energy more frequently or use BOOST Method with multiple VKs.
If he can drink charged water every 20 to 30 min , it will help more
Also if possible do VOB, writing his name and write ALL AFFECTED PARTS
You can also send energy of COMFORT and SUPPORT to affected joints.