I'm no betting expert as the Spa Backyard can confirm.
But in the future, if budget matters, put your budget all into one bet that includes your strongest opinions. (Your p4 ticket should have matched the last 4 legs of your pick 6 you couldn't afford is another way of saying this OR your p6 should have included that 4 and never should have played the p4). Playing the p4 ticket with a different horse was playing against yourself in some ways. With the p4 takeout so high at SA and the forced carryout creating lower takeout, put that extra money into the p6 only today.
Good job on Pick 4 handicapping wise (Guessing you could have had that another time or two if you only put your p6 budget into the p4 if too expensive for p6?). But again, the takeout says put that dough into the forceout p6 next time or the early p5 with the low takeout.
Keep after it. Good Luck.