This looks a lot like one deck I've taken to a couple tournaments, only mine was smaller. I had 6 dragons 6 miracles 1 morning glory and 2-3 other cards, plus pillar/pend to get to 30 cards. Given how that deck played, and how few pillars you have here, I definitely think you need more; I had more in my deck and it was 5 cards smaller than yours. If you want to take out the holy lights, my recommendation would be to replace them with pillars/pends, and give yourself an even split of pillar/pendulum in case you run into earthquake. Even with -5 holy light +5 pillar, I'd be worried that your deck is too quanta light, but that will definitely help an awful lot. Having more quanta will also indirectly help against discord, which you mentioned you have trouble with.