House Edge in negative counts.

How much does the HE increase in TCs of -1, -2, -3, -4, and -5 when using HiLo?

Is the increase in HE minimal, or great?

For general purposes counters round off and use one half a percent as the gain per one unit of true count and consider 4-8 deck games as having a house edge of one half a percent so at a true count of +1 you would be playing even, at a tc of +2 you would have a half a percent advantage. at plus three your edge would be one percent and so on. I believe with Hi Lo it's actually .46 of one percent, something to that effect. At minus one the house edge would be around one per cent, at minus two the house edge would be minus one and a half per cent and so on.
House edges on multiple decks usually run from .28 of one per cent to around .56 of one percent, before the advent of 6/5 bj and depending on surrender, splitting and all the rules combined. You can use a half a per cent and be real close. Whatever the system, you are right around a half a per cent for every plus one for all the standards, Hi Lo, Halves, Zen etc.