I am sure one of the SV International guys could comment here, but if you are saying you have difficulty in controlling your Ray 145 ltd in stronger winds, then comparing the Ultrasonic and Isonic 127. The Isonic 127 would give you all round better control for sure.......... But if you wish to plain even sooner than your Ray then it would be the Ultrasonic for sure........ But looking at your next board being F111 the IS 127 would give you better compatibility for sure...
National Watersports Festival (NWF)
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2013 Kode Wave 87 (C), 2009 Futura 93 (W), 2013 Kode 103 (W), 2013 ISonic 107 & 127 (C)
2013 Blade 4.2, 4.7 and 5.3, 2013 Gator 5.7, 2012 NCX 6.5, 2013 Overdrive R4 6.2, 7.0, 7.8 and 8.6.