I have a biocube 14 as well, I keep the temp at 76 with the heater and the highest during the day that it has gotten with the lights on has been 78, I haven't done any mod's to it yet, I did switch the actinic bulb with the 10k (so the fans come on with the actinic) as I have the actinics coming on about an hour before the daylights bulb and they stay on about an hour after the daylight turns off as well. Maybe try setting the temp a bit lower on the heater? I only have a 50 watt heater in mine as well.
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