if some pieces are too big dont be afraid to smash the rock into smaller ones. It wont hurt the bacteria or anything and you can mix and match the different pieces so you have places to put your corals.
I always have too much live rock usually, I had over 350lbs in my 125g at one point. lol Then i started a new tank and stole all the extra rock. Who knows, maybe you will want to do a small nano tank too some day soon. Best to get it all and go from there
180g- Mostly BIG fish and some coral. ~80g Nuvo- My coral tank with "happy fish"~ 90g- FOWLR Not the not happy type of fish~ 125g- Freshwater Malawi Cichlids ~10g- Nuvo- The refugees from the Ich of '18