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app_timer RAM usage on SDK 10

Is there any difference in RAM overhead with the new app_timer module on SDK 10?

I'm my application on SDK 6.1, I have 25 app_timers which run without any issue.
APP_TIMER_MAX_TIMERS 25 APP_TIMER_OP_QUEUE_SIZE 22

However I cannot use more than 10 on SDK 10 without getting a compile-time RAM overflow error. I'm trying to slowly develop an application on top of ble_app_hrs. As far as I can tell the new APP_TIMER_DEF() macro handles all memory declaration and allocation for app_timers. But is this causing more RAM overhead?

Thanks guys