(Corrects paragraph 8 to show big investors were responsible for about 68% of the flows) By Lisa Pauline Mattackal and Medha Singh (Reuters) -Paranoid? The domino downfall of FTX and other crypto custodians is enough to make the most trusting investor grab their bitcoin and shove it under the mattress. Indeed, holders big and small are taking “self-custody” of their funds, moving them from crypto exchanges and trading platforms to personal digital wallets. In a sign of this shift among retail investors, the number of bitcoin held in smaller wallets – those with under 10 bitcoin – rose to 3.35 …