Here's another article which explains the situation.
http://www.latimes.com/business/hiltzik/la-fi-mh-worker-pensions-20141205-column.html
The way I understand it, PBGC guarantees a certain level of payments to retirees based on a number of factors - retiree age, service time, etc. This level can be quite a bit lower than what a retiree was already receiving. This proposal allows trustees to theoretically cut pension payments down to a level equal to 110% of the level PBGC would provide. In other words, the trustees could cut your pension to a level a little above what you would get from the PBGC. Correct me if I'm wrong but I think that's what it's saying.
To add to what you are saying, if the PBGC will only guarantee you 35% of what you originally got, this plan will set a lower limit of 38.5% of what you originally got. That would be the lowest level you could get cut down to by the trustees. 38.5% wouldn't be the maximum amount of the cut, but rather the lowest percentage of pension you could get. The trustees could cut your pension by a maximum of 61.5% under the proposed plan.