Risks with high arbitrages
Trying to go after the highest arbs all the time is usually not a good strategy in the long run. The reason is that high arbs have a higher risk of including odds that are bookmaker mistakes, or so called palpable errors. Sometimes, the bookmaker will even void your bet. While they do pay you back your stake, it can still cost you if the voided bet was the winning one.
Arbs over 5% should automatically raise a warning flag. Pre-match arbs over 10% are almost always palpable errors.
Betting on smaller arbs more frequently will result in lesser risk for palps and you might also be limited less quickly.