I have no worries about the front poly bushes or any of the dimension.
If you look at the design and layout, the forces they see are mainly in the horizontal plain and the movement is rotational around the centre line of the bush, all good and the wish bones will see no increased stresses as a result of the polys being fitted in fact, all the polys do is stiffen up the connection to the subframe so the only potential point of stress increase would be here (and its built like a brick out house so absolutely no worries).
The rears are different, due to the sub frame and suspension design the bush is vertical and has to be able to withstand a rotational movement which is perpendicular to the centre line of the bush. Make this one stiff and you increase loadings on the wishbone significantly. Every time the suspension leg compresses/expands the flex in the wishbone will be much greater than designed and the result will be fatigue and consequentially failure.