Penu
I think you mean basal settings, not 6 basal profiles, vibe only got 4 different programmable basal profiles...
Tip about changing settings in the basal profile, I'm assuming you just got the one profile set up at the moment and this is the one you working on!
Set up a second profile, identical to your main profile, then make the adjustments on this one, see if they work if desired result achieved, transfer the setting over to the main profile. Sometimes when you making adjustments you get a knock on effect, that needs resolving problem with this, as you follow through with the adjustments you can end up in a bit of a pickle and a very muddy picture of what settings where in the basal profile worked best, and no ability to return to a known starting point!
I'm also assuming you're working on sectors of the day, don't forget when you've seem to have one cracked, recheck it hasn't got a knock on in another sector! Sometimes it's the knock on effects that make pinning the basal profile down difficult.. And once you've pinned it down don't take it for granted it's sorted... Need to do periodic reviews to ensure it doesn't need tweaking...
When it comes to sorting out profiles for other main activities, such as work days etc... The TBR is a very handy feature indeed with using the above method..