Jiyva's piety and item destruction

[Sandman25]

Why crawl does not display piety for Jiyva?
Jiyva provides conservation which stacks with cloak of preservation/amulet of conservation:

  Code:

            if (you_worship(GOD_JIYVA) && !player_under_penance()
                && x_chance_in_y(you.piety, MAX_PIETY))
            {
                ++jiyva_block;
                continue;
            }

As you can see the chance to protect items is current_piety/max_piety.
6 stars of piety is 161-200 piety so it is between 161/200=80.5% and 200/200=100%.
But I have a +1 cloak of preservation and a +1 cloak of poison. I would be happy to use the latter if I knew I am close to max piety and thus don't need preservation that much. Instead I am forced to use the former because 19.5% chance to lose consumable is quite high (I have many items in my inventory because of Jellies)

[Bloax]

As long as you aren't spamming Jiyva's abilities I can assure you that you'll be at 200 piety all the time.