By the way, I am not an expert skater. I am just saying what makes sense intuitively, and sometimes base stuff on basic physics, and on my own mistakes. A good coach is your best guide, if they have a good understanding of how this stuff works. Do you have a private coach?
Do I move the blade more inside, do I add a cushion under the big-toe side to angle the weight to the outside?
If the weight is on the inside at the ball, the insole is probably too thick there, or, more or less equivalently, too thin on the outside, or, more or less equivalently, the blade is mounted too far to the outside up front. For small changes, adjusting any of these things works. Boot fitters usually just adjust blade position and alignment, because it is easy - and if they don't have to go so far it makes your feet sore, it may be good enough.
Don't squeeze your foot so much anywhere you lose good circulation and sensation. If you add too much tape anywhere, and makes anywhere on your foot dangerously tight, it would be better to sand down the insole there than to add tape on the opposite side. And don't let the front of your toes touch anything, and the sides of the toes should touch little, or not at all.
And remember - if a pain, sore, blister, corn or callous appears anywhere, something is probably wrong.
The blade be straight up and down when you do alignment tests. If it is leaned, you will tend to curve even if the weight and alignment are right. Sometimes it is hard to feel that, and it helps to have someone (like your coach) watch you. Creating the proper blade angle is where shims come in.
Or it might be psychological. Maybe you feel a bit insecure with your eyes closed, like a beginning skater, and are afraid to place your weight on the outside of the foot, because you might fall.
Maybe alignment is a compromise. Books say there is a "fundamental longitudinal arch" (one of the 4 or 5 supportive arches on the bottom of each foot, depending on which book you read) that is capable of supporting your entire weight. If you walked along a narrow beam, you would probably roll your feet's weight along those lines. It makes sense to support the foot with the blade along that line. But it also makes sense to place the blade in such a location and orientation that you naturally tend to skate in the direction you intuitively feel you are, when you skate straight forwards or backwards. You have psychologically adapted what you feel to be the right direction to move over your lifetime while walking and running, and you don't want to try to fight that intuition too much.
If you adjust your blade position yourself, press hard into the bottom of the boot with the screwdriver, and use a screwdriver that fits. Don't tighten too much or too little. If you make mistakes, the screw strips its hole, or you strip the head of the screw. Dealing with either takes time and effort. If you have no mechanical intuition, pro shop experts, or coaches, are wonderful.
If you don't have a coach that could do the job, maybe you could have someone video tape you while you skate and try the suggested tests, and bring it back to the pro shop?