Apex sells a spring kit only. If the pull is OK to you, except for the heavy pull, try swapping out the sear and trigger springs. You can also check some of the aftermarket spring makers, to see if they sell a stock trigger and sear spring. That would likely be the cheapest way to go, price wise. I haven't seen a stand alone trigger spring or sear spring. Usually you have to buy the full trigger assembly or sear assembly.
Why not see if someone on the Forum will sell you their stock sear and trigger spring. If they installed the Apex kit, they should not need the stock springs. The only issue with the Apex springs is that they are slightly heavier than the stock springs. The Apex springs produce about one pound more pull weight than using the stock springs, when installing the Apex kit. So just swapping the MA compliant springs with the Apex springs should net a pull around 7.5 pounds. The stock springs should net a pull around 6.5 pounds.
Bob