Perhaps a measured small increase in your tool kit would help.
See if you can get something like this
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This simple cube and the app you can download will track your environment so you can change things. If the issue is humidity you can make a plastic cover and call it a humidity dome. If it is too chilly put it in a box with a heat lamp.
I followed a young fella on another board who had a photo Bruce banner deep in flower with a light a fan and a box. He looked to be clearing a couple of lids with his low tech grow.
For dollars spent vrs yield he is a legend.