Optimal bet spread

Hi!
I repeat the conditions(6D,DAS,DA2,NRA,LS,ENHC,pen 65% and pen 75%) and give the additional info,ROR to be not higher than 15%,no wonging.We are talking about KO count,so no true count is involved(I refer to the remark of bigplayer).Additional info is that the bet spread could not be more than 1-30.Thanks in advance for all answers and special thanks to bigplayer for paying attention to my message and putting his effort to help me.