you could do that, try to get your soil to back 6.8.
if you have Dolomite - next time have your mix ready 2-3 weeks before planting. mix your soil very well with Dolomite and any wormcating/perlite/compost that you use and let it sit seald for 2 -3 weeks, open and stir once in a week and your mix will be very stable with the dolomite when you plant. it should buffer itself easily with the dolomite alreay mixed and broke down with your soil.