Easy way to convert to halves

I use hi-lo but am converting to the halves count. I find it difficult to keep track of the halves and it takes longer. I now scan the table with the hi-lo count in about four seconds, then re-scan adjusting for the 7's and 9's. I only look for an imbalance, and if so I make my adjustment to the rc. If I finish up with an odd half it often is cancelled when the players take cards. At a full table there is enough time to do a second re-scan of the balance of 2's and 5's and make an adjustment if there is an imbalance.

I have played 140 hours since I started hi-lo and made 1% or $30 per hour. I am looking to improve my income. Suggestions welcomed.

Malc.