think the wet tyres should be have a little more increase in diamante, currently iirc is 5mm for the inter, and 10 mm for the wet. just double that and there is your ride height increase.
They should probably have a larger increase, it's odd that they can't just accept they'll be another 5 seconds slower with bigger tires that ruin the car dynamics a bit more... but who cares, better to race and be 5 seconds slower in conditions everyone understands the reason for than not to race.
However this was all about Grosjean being an idiot. The replay of Ham's laps was great, it showed Ham have a problem in exactly the same spot, difference was Ham caught it, let the car roll, tapped the throttle and got to the end of the straight. Grosjean lost it, caught it, floored the throttle after he'd moved off line and out of the two drier grooves on the track and he lost it immediately. It was 100% Grosjean's fault, difficult conditions, sure, but easily handled when the driver drives to the conditions.
His interviews after have been mentioning how it's impossible to drive at 300kph on the straight, he was 57kph faster than Vettel in the speed trap. He seems to have set a target of 300kph and if he didn't achieve it somehow it's bad. He was driving WAY too fast for the conditions on the straight and then even when he had a moment, he didn't just catch it and drive safely he floored it.
I've never liked Grosjean, the Spa crash was despicable driving, he had multiple other incidents, I think he was still doing utterly stupid things a couple of years ago and he's been one of the whiniest drivers of all time. This just takes the biscuit, driving 57kph faster than a monumentally better Ferrari car in conditions where that speed was reckless and unsafe... but he blames the conditions rather than his own driving again.