Make it so that your suit has to be fully charged before you can sprint.
This will make it so that you can only use sprint sparingly and at the right time. That way people won’t be sprinting left and right. Each Spartan suit could have a meter to show your current power level. Your Suit core dishes out power to various armor abilities and each armor ability requires a different Ammount of power. The power takes time to rebuild after an ability is used resulting in a time delay not unlike weapon respawn time delays.
There could be armor abilities that allow a player to drop a portable power charger that lets players recharge their suits core quicker. This equipment could be used by players that want to support other players in an indirect way.
Example:
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Player x is at a default power level of ten. The jetpack requires 10 power to be in use for 7 seconds and 5 power to remain in use for 3.5 seconds.
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Player x is at default power level of ten. The Sprint ability requires 10 power to be in use for 7 seconds.
There could be a pickup similar to the Overshield that temporarily boosts the Spartans Power core to 150%.
There could also be a twist.
When you kill another player you can take their Powercore if you have an armor ability equipped called “Leech”. Leech would increase your suits maximum possible power level to 125% for the duration of your life. Leech can only be used once because using it once increases it to 125% which is the maximum.
This would give you a reward for killing a player that you can use against them to your advantage.
This would require their to be two available armor ability slots because using leach without another armor ability to use it in conjunction with would be self defeating since you would have no ability to use the added power for.
This could be limited to a certain game-type if it would upset the balance of the game to much.
It hope that ideas like this would add balance to the use of sprint and jetpacks without removing them completely from the game. it would require players to think dynamically about power usage of their spartan suit and when to use it.