Dialing in a flower environment

Hi Mr. Grow it and community.

I am trying to dial in my flower environment from temperature and humidity perspective.

Currently I'm running,

Lights On Temp 77°F

Humidity 55%

Lights Off is sitting at around:

Temp 57°F

Humidity 70%

I feel my lights off environmental factors are impacting my flowers.

I believe I should have it dialed in as follows:

Lights Off Temp 70°F

Humidity 55%

, is that about right?

I'm in winter and dealing with low temps and high RH. RH upwards of 95%.

Running lights during day, not night. < perhaps I could switch that?

I'm running dehumidifier, does only about 150 CFM.

Tent is a > 400CFM size.

First, are my estimated lights off temps of 70F and humidity 55% correct? And if so, then any tips on getting my RH down further?

Thanks :D