Personally I would drop the dose based on that 43. Some say to wait for a # below 40, but I prefer 50 as the cutoff. If you are home to test and/or keep food out the risk may not be terrible in leaving the dose as is, but I have seen people not reduce doses when they get low #s or low PSs, and they are usually pulling an all-nighter right after that, with low #s & hypo toolkit in hand.
Just my 2c. I may be in the minority on this, and I definitely do not intend to scare you off lower #s. I might just reduce by 0.1u or something (though I would probably do 0.2u), but personally I would reduce. Holding the dose for several cycles makes sense to me when one is raising the dose, but the rule of thumb I have seen is that if you get #s too low you drop the dose immediately. I think Tilly says 3 lows maybe (?) but that is designed for other insulins so I don't know that you can apply it here directly as is.
With Bix, once we got to good #s I had to lower the dose almost immediately to keep him from going lower, and over a course of several days it turned out that he needed to be dropped down in small increments to stay in good #s. He went from 1.8 down to 1.2 over about a week, during which I continually fine-tuned the dose to keep him right in the #s I wanted. I don't want you to lose progress by reducing too much, but do want you to know that sometimes once they get in good #s their liver reactions will settle down, and they don't need as much to stay in those #s. The "dose reduction" path, just want to be sure you are aware of that!!!
p.s. if it might help you, check out Bix's SS around 7/20 to see how things went for him...