I have just had to make the switch from Apidra to Humalog and I feel like I am back at square one. I expected things to go about the same with both insulins but using the same insulin to carb ratios with Humalog as I used with Apidra is not working. Adjusted a little today but still saw a huge rise about 3 hours after I ate. Anyone have experience having used both?
I switched from Humalog to Apidra. My ratios didn’t change at all, but my timing management changed a ton (that was why I switched). For me, Apidra kicks in a whole lot quicker and has much less tail. My guess would that the Humalog still has significant action left to go for you after that 3hr mark (maybe 1/4 or even 1/3 of total action), whereas your food is done digesting: hence the spike. First thing I would suggest is to try a much much longer prebolus period than you’re used to with Apidra. Careful with just raising your I:C ratio, as you may see crashes hours later and not know why, especially if you’ve eaten again since. Took me months to figure out what was going on. 
If the insulin was still acting after digestion wouldn’t I go low instead? Or is it that a unit of humalog and a unit of Apidra have the same effect just at different rates so the digestion goes faster than the humalog acts?
The second one. 