No, you did everything exactly as I did. Well I must say I know nothing about EE so perhaps, improbable as it may be, EE changes opcode 190 from cumulative to non-cumulative. However, let's first look at all options. If you use the link I gave you you'll learn that abilities of kensai are governed by clabfi04.2da. In my case (classic engine) attack speed improvement (opcode 190) is applied via spcl143.spl, which is listed in said clabfi04.2da as being applied at levels 1, 4 and 8 (and level 13 further which makes the whole progression inconsistent but whatever), that's why lvl10 kensai should have 3 instances of opcode 190 applied, and since it's the same spell applied 3 times it just can't have different numbers set to "amount" field. Does that implemented in the same way so far for EE?
Nope, in EE it is still spcl143.spl but opcode 190 definetely has become overriding as In EE spcl143.spl comprised of 190 opcodes for every 4th level and amount field is incremented for each consequent opcode (1:1, 4:2, 8:3, 12:4, 16:5...).
Well, it seems we found a small bug in speed factor progression for kensai in both engines. I mean the proper way should be to apply 190 should be: 4, 8, 12, 16....