I had a god tier run with Perfected Strike the other day. Got Clone on it and had Bing Bong too! Ended up killing the Queen in one hit and unfortunately got Test Subject instead of Aeon Glass so that fight took three turns lol. But yeah I don't take Perfected Strike often anymore.
It feels like ruined helmet shouldn't interact with vajra tbh. Vajra is "start each combat with 1 strength" and helmet says "the first time you gain strength each combat, double it".
Starting a fight with 1 strength isn't the same as gaining a strength in combat imo.