If you can't find satisfaction, and/or are fiendish about a custom tune for your specifics, get a custom map done by a good tuner.
A bit more on getting a custom map done.
919s have a high volume X low heat rejection area cooling system design.
While this is extremely rarely ever a problem (aside from high temp X low humidity X hi altitude air X sustained (or high time component of a track lap) high power levels, it can all too easily be problematic during mapping.
The 919 ECU (per LDH advice from eons ago and likely long forgotten by too many) has enrichening steps that kick in once the coolant temperature rises past the ideal range.
(my guess is the enrichening steps are intended to reduce combustion chamber heat load into the cooling system, noting power will also be reduced)
A 919 is into the fuel enrichening zone when the coolant fan kicks in.
If a 919 is being mapped while the cooling fan is on, the mapping will be incorrect, as the PC's mapping correction will be based on an enriched, and not normal, amount of fueling as called for the ECU's map. (remember, the map in the PC3 is a mapping correction laid over the ECU's map)
In other words, any part of a dyno run that is done with the cooling fan running, it botched.
And because of small rad and the large coolant volume, it takes longer to knock the coolant temperature down during the inter dyno run cool-off periods.
Today's tidbit : For track days, and IF your coolant is running hot because of above referred to conditions, remove the fan ! At speed, the fan restricts flow for the area it blankets and effectively reduces the heat rejection rate of the rad. Another trick is to run 10 % EG 90 % water along with WaterWetter. The 10/90 formula increases the specific heat of the coolant and improves its heat rejection rate of the overall cooling system. The 10 % EG content makes sure you have decent water pump seal lubrication, as hot water has very poor lubricating properties. If you want some antifreeze effect, use 25 % EG instead of 10, and keep in mind that 25 % EG isgood to roughly -10 F
AND won't actually freeze solid below that, and instead "slush up".