Not sure what you mean "by my WBC dropped lower than normal". If you asked most of us our "normal" WBC is lower than what is considered normal for people who don't have leukemia. Platelets are notoriously hard to count because they are sticky, 99 could just as easily be 129. Unless your counts are dangerously low I wouldn't let my onc mess with my meds so early in the game. By that I mean ANC is 500 (.5) or lower. Platelets are often the last to normalize and 99 doesn't put you anywhere near a danger zone.
Attaining CHR (complete hematological response), the first benchmark, just means your counts are within (or below) normal range.
I'd be nervous messing with the Sprycel dosage this early in the game. You want to get and keep your CML under control. More important than your blood counts in the long run is your FISH and, later, your PCR results. Getting and keeping the CML under control is your goal.
You'll be fine, but it will be awhile before your counts decide on a level and stay there! 
Pat
"You can't change the direction of the wind but you can adjust your sails."
DX 12/08; Gleevec 400mg; liver toxicity; Sprycel 100mg.; CCyR 4/10; MMR 8/10; Pleural Effusion 2/12; Sprycel 50mg. Maintaining MMR; 2/15 PCRU; 8/16 drifting in and out of undetected like a wave meeting the shore. Retired 12/23/2016! 18 months of PCRU, most recent at Mayo on 7/25/17 was negative at their new sensitivity reporting of 0.003.<p>