earth juice grow

i'd like to know if there is a way to raise the ph level in my nute mix with out useing ph up. I am coserned about salt build up in my happy frog potting soil and perlite grow miduem . the mix was 3/1 and the HP soil has dolmite in it , but my runoff tests at 5.9. I like to get nurt. mix up to 6.3, but it takes alot of ph up to get there. I mix grow,bloom, meta-k, mirco nuts, instant karma and catalyst. Im 21, days into veg, aiming at 30 days before going to flower. And i'am going LST firsttime, with cali mist,first time also. Any tips on LST, as in do i still tied plants in flower stage. IM giving plants one good dose of grow N ,day 21s in veg then cutting back on N. any tips would be welcomed