(Major Newbie) Help, I need advice

[LittleMadSnek]

I don't have the snake yet, I'm giving myself some time on learning how to maintain the enclosure.
So far I have:

-50 Quart tub
-ZooMed Eco Earth Coconut Fiber subtrate
-Two ExoTerra 50 Watt heat bulbs: Day and Night
-An All Living Things heat lamp that has ceramic on it
-ZooMed Dual Gauge
(I read the dual gauge is inaccurate so I ordered the AcuRite digital thermometer)

I plan on buying:

-2 hide spots
-1 humidity box
-medium water dish
-AcuRite Thermometer
-Digital kitchen scale
-Etekcity Lasergrip 774
(I would add undertank heater but it gets pretty hot and I think the lamp and the heat here in Cali should be enough)

I'm having problems maintaining humidity and basking temps. I assume once I get the water dish and some moss it'll be a nice help with humidity but the there's not enough heat for whatever reason? I have about half of the tub's lid cut and replaced it with wire mesh, the heat lamp sits directly on the wire but it stays in the 70s and only reached the high 80s once. My only idea as to why this is happening is because I was misting the enclosure with the wire mesh still sitting on top(the lamp was off of the tub) and didn't really dry it, could the evaporating water from the wire do anything damaging to the lamp? I doubt it but that's my only guess.

Are there products that I should eventually upgrade that'll save me time and money? Are there any tricks/useful tips? Should I add anything on the list?