I have six GPTs with the original part #70272. A new Glock with a new GPT #70272 pulls right around 5 lbs on my scale, so I am not clear if Glock increased the return spring strength on the new part 74332 or just put a more realistic pull weight on the box. Anyway, the new part isn't in stock at my preferred retailer yet, but when I get one I'll compare them and post.
At this point I have over 4,000 rounds on two training pistols with GPTs and have yet to encounter any issues. They both pull about 4.5 lbs now and the pull has smoothed out a bit, but the wall and break are still well defined. Not as good as my M&P M2.0 Apex forward set trigger, but not that far behind.
I don't recall if I applied any lube to the trigger after doing so on initial installation (note: there are some new lube points on the GPT in addition to the connector), but I'll shoot about 6,000 rounds training over the coming months and will make a note not to lube my GPTs and see what happens.