Pick 3, 4 and 6 ticket structure

My philosophy with the ticket structure is: Make a pick 3 a pick 2, make a pick 4 a pick 3 and make a pick 6 a pick 4. Is this ticket structure philosophy incorrect? If there a better way. I do not seem very confident in my ticket structures for these bets. I typically try to keep my pick 6 under $160. I try to keep my pick 4 under $60 and I try to keep my pick 3 under $30 (all for $1). Ticket structure isn't my strong suit, but some on here are great at it. Any advice is appreciated. Thanks in advance.