This is what I am doing over easter. Have siliconed around the metal bracket on all the coils and am going to change back to 1.1mm gap plugs. FYI I previously had BCPR5ES 1.1 and changed them to 6's @ 0.8 and the car is missing all over the shop.
See what happens. BTW for those of you that might be aware of how hot the coils get. I drove my car home from work, reversed in the driveway the spent about 30 preparing stuff before I touched the coilpacks. Even after this time (no coilpack cover installed) the packs were so hot I had to use gloves to remove them.
No wonder they crack after 16years.