Best battery to run LED's off while parked

I currently have my boat set up where i have two Interstate 24m-xhd batteries on a Perko with 1,2 and all postion. I run all my stereo off the the Kinetik 2400's which have their own On/Off switch. The LED's are tied into the Interstates.

Issue: When parked for about 1:30 to 2 hours I will kill battery 1 with all the LED's on...the lights are obviously still on but I am not able to crank. For those who havent seen my boat i have a whole ton. This hasnt been much of an issue b/c when im ready to leave i switch over to battery 2 and it cranks right up. The LED's will also dim a little bit once the voltage drops down.

What I have tried: I slapped in a brand new Optima blue top D34M in the battery 1 postion today. Once installed I left the LED's on for 4:30 hours and it would still have just enough juice to turn over. After just over 5+ hours the boat wouldnt turn over. The Optima only had around 12.3 volts in it when i started this. This is a huge improvement and i can live with this.

To me it looks like the Interstate has crapped out on me. The difference in Ah cant be that far apart in both of those batteries...i believe the Optima is either55 or 75Ah, not sure on the Interstate.

Solution: What batteries would be the right choice for leaving LOTS of LED's on for a long time without dimming and still be able to crank up just in case of emergency?