Dose advice for Elizabeth and Priss on Health

[Carl & Polly & Bob (GA)]

Vet wants to increase from 1.5u to 2u, but she's been getting no-shot preshots on occasion. Has been DKA in the past. I think she's been on insulin since last April.
http://felinediabetes.com/FDMB/viewtopic.php?f=28&t=92327#unread
Thanks!