I made a mistake in the calculation, I took the SBD value at 1:1 with the USD value, this is before I realised the escalation in SBD recently. SBD was at approx $11 on 17th Dec 2017, so I should have sent $96 or 192SLR (0.50$/SLR). The balance of 172 SLR sent in this TX https://chainz.cryptoid.info/slr/tx.dws?3526517.htm