First please do not buy a coil UVB they are no good and adequate - they cause a lot of health issues including MBD --- you want either a Zoo Med 24" fixture this will come w/a 5.0 bulb for your tank you need a 22" Reptisun 10.0 T 5 keep the 5.0 as a back up the distance and placement is different from the 10.0 bulb- or get this one a 24" Arcadia Pro T 5 w/ the 12% bulb here are some links and you need this right away if you have no UVB --
Arcadia ProT5 12%
UVB Bulb With Hood is a highly adaptable lighting kit with high-quality internal electronics designed for optimal reptile husbandry. Get yours today from Pangea Reptile!
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Efficient and sleek t5
UVB light fixture for reptiles terrariums and more! Order your lighting and supplies today from Pangea Reptile.
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When you get the UVB please post back on here I will help you place it for your tank - that will depend on your screen -- I cant tell if its a fine mesh like a screen door or a wide hole type --
Basking bulb is not getting your temps high enough obviously-- please try a 150 watt -- how long did you leave the probe on the log it seems it should be getting hotter than that -- how old is the bulb?