You are not in any way a failure
@Woodywoodpecker . You are already managing so many things and doing the same as the rest of us - gradually getting your head round what works for you and making adjustments as necessary. well done.
If you are spiking then having to have a snack to keep your levels up after breakfast it sounds to me like there is too much much insulin. Could you adjust your carb ratio?
The pre-bolus timing sounds like it is sorting the spike, and you can continue to adjust that as necessary.
It is your appointment on Monday and their focus should be enabling you to manage your diabetes effectively in your life. Your welding work sounds like a very good reason to be safe around lower levels and a target of 5 sounds very sensible. Explain to them why, and how this gives you time to head off any hypos.
You will have your quick acting carbs at the ready at work. In the welding centre a juice could be good as that can be even quicker than jelly babies or the like, especially if you swill it around in your mouth where the glucose can start to be absorbed.
Remember how well you are doing and turn up on Monday with a list of questions for them to sort out, armed with explanations of anything you have already needed to change. (I had to adapt my settings on my pump to suit me and my consultant was happy to listen to my reasoning). Let us know how you get on.