My first thought is that if you have a +10 True Count (High-Low?) you're probably already making a max bet so for the sake of safety I'd probably just ride the slug out without any bet adjustment.
Arnold suggests that using an alternative strategy to the NRS will get most of it's value without the need of doing any complex calculations. It consists of just cutting your bet by half if you get your expected drop in the count (big cards) before your slug is done and dropping your bet completely if you get 150% of your expected big cards before the slug (playzone) is finished.
Before you raise your bet into a rising count in a tracked slug you should be 100% sure your cut was accurate. Always err on the side of caution with regards to betting with a pure ST game. When ST shoes (especially bigger slugs) you get a lot more chances for big bets but often at just barely at the threshold for those big bets so you get some massive swings...this is why many ST teams will underbet those slugs somewhat because they know the increased opportunities will make up for the difference.
If you are small slug tracking (with bigger resulting edges during those) there is a much higher chance for error because very precise cutting is required and that itself calls for accounting for the possibility of error in your bet sizing.
I know many players who cut into an expected slug but missed it (putting the big cards out of play) and just kept on raising their bets as the small cards continued to come out only to find the big cards never came out. Many a bankroll gets destroyed when you ST and miss or get too aggressive with your betting.
BTW, you can eliminate the chance for error by cutting your slug to the 3rd (or 3.5th) deck instead of the 1st deck. You lose the benefit of cover BUT you basically turn the six deck game into a 1 or 2 deck game which allows you to use a very tight betting spread and a play-all approach which might fly below the casinos radar and if you cut the big cards to the 3rd (or 3.5th) deck the count should rise naturally right into your slug. Normally you get to make big bets 1 shoe out of 5, if you can cut a big slug to be the last deck to be played you will be able to make a big bet every shoe which changes the TC distribution and means a smaller spread will beat the game AND you will know your cut is correct because the count rises into it. Also, if the casino does inside plugging the slug you just played will always be the tops of the discards making it possible to recycle them for multiple shoes.