Yes, you have done a wonderful job with the enclosure.
The highest UVB that a Veiled has been raised under is a 6 UVI level. So we know that up to 6 UVI is still safe. Your levels jump really fast though moving toward the fixture. If you had a solarmeter 6.5 you would be shocked at how high they get a few inches down. And vise versa they reduce quite fast moving away from the fixture once you get passed 12-15 inches it is virtually nothing for UVI.
For example 1 inch below the screen I get a 15.5, 3 inches below the screen I get a 10.2. Then I have my branches exactly 8.5 inches down. This gives me a 3 at the branch and a 4UVI at the top of the back. Now if I go 14 inches down I pull a 0.5 UVI level.
I run single bulb t5 fixture with a 6% Uvb bulb. Of course fixture type, bulb strength and even the material that the screen is will give you different UVI readings then the next person. So this is why we say for what your using your looking at the 8-9 inch distance for the sweet spot.
So it is an extreme unsafe high level to drastic reduction to nothing.
I am using these daylight bulbs. I really like them and they put out great light. I would recommend them over others if you want to replace that front UVB bulb with a daylight bulb.
https://www.bigalspets.com/zoo-med-ultra-sun-6500k-super-daylight-t5-ho-lamps.html