I was also going to say alternating sounds risky. Fluctuations are as much of the problem as levels, as I’ve learned to my cost.
Unfortunately cost of specialist doesn’t mean they are gospel. The BmS had to put out a statement, plus plenty press coverage, because of risks from some of most expensive over-prescribing.
I’ve learned all this the hard way, there’s so much contradictory advice out there, and of course different things work for different people (and at different times).
I’ve seen very expensive pvt specialists, the second of whom contradicted the first.
As others have suggested, start low, build slowly (weeks not days once you get higher) and personally I’d avoid alternating. I’ve not done gel but some people split am and pm which may also help keep it steady.
Good luck! X