Add 2 More Units to the stack...
Seriously, what I do when the count gets good (and I'm NOT playing head's up) rather than add to an already large stack of chips is spread to two spaces. If it's done right, it will look like you are betting "less", when in fact, you have more money on the felt.
Two things, though. You have to be playing a game that will allow you to spread, as many won't. And...you need to be sitting at a table that has an open space next to you.
You also need to stay under the radar. Don't get greedy and blow out a good place to play in the future. You don't say whether this a DD or shoe game you are playing. Assuming it's a shoe game. If so, bigger spreads are more tolerable, go ahead and don't worry about it.
Many good books are out there that can explain this better than I can.